Implement timeline control and trace viewer for gpu profiling.

The general design here is:
  TraceController: manages collection of trace data from the backend
  RawEventView: new tab in about:gpu that shows trace events collected in raw form
  TimelineView: new tab in about:gpu that shows a timeline of events, broken out by thread and colored by name

The TimelineView is built around a TimelineModel class. The TimelineModel class takes as input the BEGIN/END events from TraceEvent and converts them into processes, threads, threads, slices and subrows.

Slices represent a single BEGIN-END pair. Since slices can nest, slices have subSlices. E.g. B(x) B(y) E(y) E(y) yields  slice(x) with subslice (y). A thread stores slices grouped into subrows, which are slicesall of the same logical nesting depth. With the previous example, the thread would have two subrows, one containing just x, and one containing just Y.

The TimelineModel is visualized by a Timeline class in gantt-chart form. The Timeline decorates a div and builds inside that div a number of canvas elements, one element per subRow across all threads in the capture. Within that canvas, we visualize the slices against a scale+translate transform, manipulable with w/a s/d keys for zooming and panning, respectively. When drawing, we collapse together rectangles that are subpixel, avoiding the cost of rasterizing them entirely.

This code is all stubbed out so that it does not show up in the about:gpu within chrome. We will turn it on once the trace_event rewrite lands. If you run it standalone with ~nduca/emulate_webui.py, it becomes active.

BUG=
TEST=

Review URL: http://codereview.chromium.org/6542012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@77503 0039d316-1c4b-4281-b951-d872f2087c98

20 files changed, 1678 insertions, 72 deletions

diff --git a/chrome/browser/resources/gpu_internals.html b/chrome/browser/resources/gpu_internals.html
index bdcea10..8763249 100644
--- a/chrome/browser/resources/gpu_internals.html
+++ b/chrome/browser/resources/gpu_internals.html
@@ -23,35 +23,57 @@ body {
   margin: 0;
 }
 </style>
-<link rel="stylesheet" href="gpu_internals/tab_control.css">
 <link rel="stylesheet" href="gpu_internals/info_view.css">
+<link rel="stylesheet" href="gpu_internals/overlay.css">
+<link rel="stylesheet" href="gpu_internals/tab_control.css">
+<link rel="stylesheet" href="gpu_internals/timeline_view.css">
+<link rel="stylesheet" href="gpu_internals/timeline.css">
+<link rel="stylesheet" href="gpu_internals/tracing_controller.css">
 <script src="chrome://resources/js/cr.js"></script>
 <script src="chrome://resources/js/cr/event_target.js"></script>
 <script src="chrome://resources/js/cr/ui.js"></script>
 <script src="chrome://resources/js/util.js"></script>
 <script src="gpu_internals/tab_control.js"></script>
+<script src="gpu_internals/overlay.js"></script>
 <script src="gpu_internals/browser_bridge.js"></script>
+<script src="gpu_internals/tracing_controller.js"></script>
 <script src="gpu_internals/info_view.js"></script>
-
+<script src="gpu_internals/timeline_model.js"></script>
+<script src="gpu_internals/sorted_array_utils.js"></script>
+<script src="gpu_internals/timeline.js"></script>
+<script src="gpu_internals/timeline_track.js"></script>
+<script src="gpu_internals/fast_rect_renderer.js"></script>
+<script src="gpu_internals/timeline_view.js"></script>
+<script src="gpu_internals/simulated_trace_data.js"></script>
 
 <script>
-var browser;
+var browserBridge;
+var tracingController;
+var timelineView; // made global for debugging purposes only
 
 /**
  * Main entry point. called once the page has loaded.
  */
 function onLoad() {
   browserBridge = new gpu.BrowserBridge();
+  if (browserBridge.debugMode)
+    tracingController = new gpu.TracingController();
 
   // Create the views.
   cr.ui.decorate('#info-view', gpu.InfoView);
 
+  timelineView = $('timeline-view');
+  if (browserBridge.debugMode)
+    cr.ui.decorate(timelineView, gpu.TimelineView);
+  else
+    timelineView.parentNode.removeChild(timelineView);
+
   // Create the main tab control
   var tabs = $('main-tabs');
   cr.ui.decorate(tabs, gpu.TabControl);
 
   // Sync the main-tabs selectedTabs in-sync with the location.
-  tabs.addEventListener('selectedTabChanged', function() {
+  tabs.addEventListener('selectedTabChange', function() {
     if (tabs.selectedTab.id) {
       history.pushState('', '', '#' + tabs.selectedTab.id);
     }
@@ -78,6 +100,9 @@ document.addEventListener('DOMContentLoaded', onLoad);
   <!-- Tabs -->
   <div id="main-tabs">
     <include src="gpu_internals/info_view.html">
+    <include src="gpu_internals/timeline_view.html">
   </div>
+
+  <include src="gpu_internals/tracing_controller.html">
 </body>
 </html>
diff --git a/chrome/browser/resources/gpu_internals/browser_bridge.js b/chrome/browser/resources/gpu_internals/browser_bridge.js
index 9e7cc82..1b1a97c 100644
--- a/chrome/browser/resources/gpu_internals/browser_bridge.js
+++ b/chrome/browser/resources/gpu_internals/browser_bridge.js
@@ -12,9 +12,12 @@ cr.define('gpu', function() {
     // If we are not running inside WebUI, output chrome.send messages
     // to the console to help with quick-iteration debugging.
     if (chrome.send === undefined && console.log) {
+      this.debugMode_ = true;
       chrome.send = function(messageHandler, args) {
         console.log('chrome.send', messageHandler, args);
       };
+    } else {
+      this.debugMode_ = false;
     }
 
     this.nextRequestId_ = 0;
@@ -28,6 +31,14 @@ cr.define('gpu', function() {
     __proto__: cr.EventTarget.prototype,
 
     /**
+     * Returns true if the page is hosted inside Chrome WebUI
+     * Helps have behavior conditional to emulate_webui.py
+     */
+    get debugMode() {
+      return this.debugMode_;
+    },
+
+    /**
      * Sends a message to the browser with specified args. The
      * browser will reply asynchronously via the provided callback.
      */
@@ -72,6 +83,6 @@ cr.define('gpu', function() {
   };
 
   return {
-    BrowserBridge : BrowserBridge
+    BrowserBridge: BrowserBridge
   };
 });
diff --git a/chrome/browser/resources/gpu_internals/fast_rect_renderer.js b/chrome/browser/resources/gpu_internals/fast_rect_renderer.js
new file mode 100644
index 0000000..ef80326b
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/fast_rect_renderer.js
@@ -0,0 +1,120 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview Provides a mechanism for drawing massive numbers of
+ * colored rectangles into a canvas in an efficient manner, provided
+ * they are drawn left to right with fixed y and height throughout.
+ *
+ * The basic idea used here is to fuse subpixel rectangles together so that
+ * we never issue a canvas fillRect for them. It turns out Javascript can
+ * do this quite efficiently, compared to asking Canvas2D to do the same.
+ *
+ * A few extra things are done by this class in the name of speed:
+ * - Viewport culling: off-viewport rectangles are discarded.
+ *
+ * - The actual discarding operation is done in world space,
+ *   e.g. pre-transform.
+ *
+ * - Rather than expending compute cycles trying to figure out an average
+ *   color for fused rectangles from css strings, you instead draw using
+ *   palletized colors. The fused rect is the max pallete index encountered.
+ *
+ * Make sure to flush the trackRenderer before finishing drawing in order
+ * to commit any queued drawing operations.
+ */
+cr.define('gpu', function() {
+
+  /**
+   * Creates a fast rect renderer with a specific set of culling rules
+   * and color pallette.
+   * @param {GraphicsContext2D} ctx Canvas2D drawing context.
+   * @param {number} vpLeft The leftmost visible part of the drawing viewport.
+   * @param {number} minRectSize Only rectangles with width < minRectSize are
+   *    considered for merging.
+   * @param {number} maxMergeDist Controls how many successive small rectangles
+   *    can be merged together before issuing a rectangle.
+   * @param {number} vpRight The rightmost visible part of the viewport.
+   * @param {Array} pallette The color pallete for drawing. Pallette slots
+   *    should map to valid Canvas fillStyle strings.
+   *
+   * @constructor
+   */
+  function FastRectRenderer(ctx, vpLeft, minRectSize, maxMergeDist, vpRight,
+                            pallette) {
+    this.ctx_ = ctx;
+    this.vpLeft_ = vpLeft;
+    this.minRectSize_ = minRectSize;
+    this.maxMergeDist_ = maxMergeDist;
+    this.vpRight_ = vpRight;
+    this.pallette_ = pallette;
+  }
+
+  FastRectRenderer.prototype = {
+    y_: 0,
+    h_: 0,
+    merging_: false,
+    mergeStartX_: 0,
+    mergeCurRight_: 0,
+
+    /**
+     * Changes the y position and height for subsequent fillRect
+     * calls. x and width are specifieid on the fillRect calls.
+     */
+    setYandH: function(y, h) {
+      this.flush();
+      this.y_ = y;
+      this.h_ = h;
+    },
+
+    /**
+     * Fills rectangle at the specified location, if visible. If the
+     * rectangle is subpixel, it will be merged with adjacent rectangles.
+     * The drawing operation may not take effect until flush is called.
+     * @param {number} colorId The color of this rectangle, as an index
+     *     in the renderer's color pallete.
+     */
+    fillRect: function(x, w, colorId) {
+      var r = x + w;
+      if (r < this.vpLeft_ || x > this.vpRight_) return;
+      if (w < this.minRectSize_) {
+        if (r - this.mergeStartX_ > this.maxMergeDist_)
+          this.flush();
+        if (!this.merging_) {
+          this.merging_ = true;
+          this.mergeStartX_ = x;
+          this.mergeCurRight_ = r;
+          this.mergedColorId = colorId;
+        } else {
+          this.mergeCurRight_ = r;
+          this.mergedColorId = Math.max(this.mergedColorId, colorId);
+        }
+      } else {
+        if (this.merging_)
+          this.flush();
+        this.ctx_.fillStyle = this.pallette_[colorId];
+        this.ctx_.fillRect(x, this.y_, w, this.h_);
+      }
+    },
+
+    /**
+     * Commits any pending fillRect operations to the underlying graphics
+     * context.
+     */
+    flush: function() {
+      if (this.merging_) {
+        this.ctx_.fillStyle = this.pallette_[this.mergedColorId];
+        this.ctx_.fillRect(this.mergeStartX_, this.y_,
+                           this.mergeCurRight_ - this.mergeStartX_, this.h_);
+        this.merging_ = false;
+      }
+    }
+  };
+
+  return {
+    FastRectRenderer: FastRectRenderer
+  };
+
+});
diff --git a/chrome/browser/resources/gpu_internals/info_view.js b/chrome/browser/resources/gpu_internals/info_view.js
index 6bf8340..26a193f 100644
--- a/chrome/browser/resources/gpu_internals/info_view.js
+++ b/chrome/browser/resources/gpu_internals/info_view.js
@@ -1,15 +1,12 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+
 /**
- * This view displays options for importing/exporting the captured data. Its
- * primarily usefulness is to allow users to copy-paste their data in an easy
- * to read format for bug reports.
- *
- *   - Has a button to generate a text report.
- *
- *   - Shows how many events have been captured.
+ * @fileoverview This view displays information on the current GPU
+ * hardware.  Its primary usefulness is to allow users to copy-paste
+ * their data in an easy to read format for bug reports.
  */
 cr.define('gpu', function() {
   /**
@@ -54,14 +51,14 @@ cr.define('gpu', function() {
      */
     beginRequestLogMessages: function() {
       browserBridge.callAsync('requestLogMessages', undefined,
-        (function(messages) {
-           if(messages.length != this.logMessages_.length) {
-             this.logMessages_ = messages;
-             this.refresh();
-           }
-           // check again in 250 ms
-           window.setTimeout(this.beginRequestLogMessages.bind(this), 250);
-         }).bind(this));
+          (function(messages) {
+            if (messages.length != this.logMessages_.length) {
+              this.logMessages_ = messages;
+              this.refresh();
+            }
+            // check again in 250 ms
+            window.setTimeout(this.beginRequestLogMessages.bind(this), 250);
+          }).bind(this));
     },
 
     /**
@@ -71,18 +68,18 @@ cr.define('gpu', function() {
       // Client info
       if (this.clientInfo_) {
         var chromeVersion = this.clientInfo_.version +
-          ' (' + this.clientInfo_.official +
-          ' ' + this.clientInfo_.cl +
-          ') ' + this.clientInfo_.version_mod;
+            ' (' + this.clientInfo_.official +
+            ' ' + this.clientInfo_.cl +
+            ') ' + this.clientInfo_.version_mod;
         this.setTable_('client-info', [
-            {
-              description: 'Data exported',
-              value: (new Date()).toLocaleString()
-            },
-            {
-              description: 'Chrome version',
-              value: chromeVersion
-            }]);
+          {
+            description: 'Data exported',
+            value: (new Date()).toLocaleString()
+          },
+          {
+            description: 'Chrome version',
+            value: chromeVersion
+          }]);
       } else {
         this.setText_('client-info', '... loading...');
       }
@@ -93,13 +90,13 @@ cr.define('gpu', function() {
       var gpuInfo = browserBridge.gpuInfo;
       if (gpuInfo) {
         if (gpuInfo.blacklistingReasons) {
-          blacklistedIndicator.style.display = 'block';
+          blacklistedIndicator.hidden = false;
           // Not using jstemplate here because we need to manipulate
           // href on the fly
           var reasonsEl = blacklistedIndicator.querySelector(
               '.blacklisted-reasons');
-          reasonsEl.textContent = "";
-          for (var i = 0; i < gpuInfo.blacklistingReasons.length; ++i) {
+          reasonsEl.textContent = '';
+          for (var i = 0; i < gpuInfo.blacklistingReasons.length; i++) {
             var reason = gpuInfo.blacklistingReasons[i];
 
             var reasonEl = document.createElement('li');
@@ -110,7 +107,7 @@ cr.define('gpu', function() {
             reasonEl.appendChild(desc);
 
             // Spacing ':' element
-            if(reason.cr_bugs.length + reason.webkit_bugs.length > 0) {
+            if (reason.cr_bugs.length + reason.webkit_bugs.length > 0) {
               var tmp = document.createElement('span');
               tmp.textContent = '  ';
               reasonEl.appendChild(tmp);
@@ -119,59 +116,61 @@ cr.define('gpu', function() {
             var nreasons = 0;
             var j;
             // cr_bugs
-            for (j =  0; j < reason.cr_bugs.length; ++j) {
+            for (j = 0; j < reason.cr_bugs.length; ++j) {
               if (nreasons > 0) {
                 var tmp = document.createElement('span');
                 tmp.textContent = ', ';
                 reasonEl.appendChild(tmp);
               }
 
-              var lnk = document.createElement('a');
+              var link = document.createElement('a');
               var bugid = parseInt(reason.cr_bugs[j]);
-              lnk.textContent = bugid;
-              lnk.href = 'http://crbug.com/' + bugid;
-              reasonEl.appendChild(lnk);
-              nreasons += 1;
+              link.textContent = bugid;
+              link.href = 'http://crbug.com/' + bugid;
+              reasonEl.appendChild(link);
+              nreasons ++;
             }
 
-            for (j =  0; j < reason.webkit_bugs.length; ++j) {
+            for (j = 0; j < reason.webkit_bugs.length; ++j) {
               if (nreasons > 0) {
                 var tmp = document.createElement('span');
                 tmp.textContent = ', ';
                 reasonEl.appendChild(tmp);
               }
 
-              var lnk = document.createElement('a');
+              var link = document.createElement('a');
               var bugid = parseInt(reason.webkit_bugs[j]);
-              lnk.textContent = bugid;
+              link.textContent = bugid;
 
-              lnk.href = 'https://bugs.webkit.org/show_bug.cgi?id=' + bugid;
-              reasonEl.appendChild(lnk);
-              nreasons += 1;
+              link.href = 'https://bugs.webkit.org/show_bug.cgi?id=' + bugid;
+              reasonEl.appendChild(link);
+              nreasons ++;
             }
 
             reasonsEl.appendChild(reasonEl);
           }
         } else {
-          blacklistedIndicator.style.display = 'none';
+          blacklistedIndicator.hidden = true;
         }
         this.setTable_('basic-info', gpuInfo.basic_info);
 
         if (gpuInfo.diagnostics) {
-          diagnostics.style.display = 'block';
+          diagnostics.hidden = false;
           this.setTable_('diagnostics-table', gpuInfo.diagnostics);
         } else {
-          diagnostics.style.display = 'none';
+          diagnostics.hidden = true;
         }
       } else {
-        blacklistedIndicator.style.display = 'none';
+        blacklistedIndicator.hidden = true;
         this.setText_('basic-info', '... loading ...');
-        diagnostics.style.display = 'none';
+        diagnostics.hidden = true;
       }
 
       // Log messages
-      jstProcess(new JsEvalContext({values: this.logMessages_}),
-                 document.getElementById('log-messages'));
+      if (!browserBridge.debugMode) {
+        jstProcess(new JsEvalContext({values: this.logMessages_}),
+                   document.getElementById('log-messages'));
+      }
     },
 
     setText_: function(outputElementId, text) {
@@ -196,4 +195,4 @@ cr.define('gpu', function() {
   return {
     InfoView: InfoView
   };
-});
\ No newline at end of file
+});
diff --git a/chrome/browser/resources/gpu_internals/overlay.js b/chrome/browser/resources/gpu_internals/overlay.js
index 9a87d7d..720065c 100644
--- a/chrome/browser/resources/gpu_internals/overlay.js
+++ b/chrome/browser/resources/gpu_internals/overlay.js
@@ -1,8 +1,9 @@
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+
 /**
- *
  * @fileoverview Implements an element that is hidden by default, but
  * when shown, dims and (attempts to) disable the main document.
  *
@@ -22,7 +23,7 @@ cr.define('gpu', function() {
    */
   var OverlayRoot = cr.ui.define('div');
   OverlayRoot.prototype = {
-    __proto__ : HTMLDivElement.prototype,
+    __proto__: HTMLDivElement.prototype,
     decorate: function() {
       this.classList.add('overlay-root');
       this.visible = false;
@@ -136,7 +137,7 @@ cr.define('gpu', function() {
   var Overlay = cr.ui.define('div');
 
   Overlay.prototype = {
-    __proto__ : HTMLDivElement.prototype,
+    __proto__: HTMLDivElement.prototype,
 
     /**
      * Initializes the overlay element.
@@ -171,6 +172,6 @@ cr.define('gpu', function() {
       Overlay.prototype.onVisibleChanged_);
 
   return {
-    Overlay : Overlay
+    Overlay: Overlay
   };
-});
\ No newline at end of file
+});
diff --git a/chrome/browser/resources/gpu_internals/overlay_test.html b/chrome/browser/resources/gpu_internals/overlay_test.html
index 34de09c..c06572c 100644
--- a/chrome/browser/resources/gpu_internals/overlay_test.html
+++ b/chrome/browser/resources/gpu_internals/overlay_test.html
@@ -1,4 +1,9 @@
 <!DOCTYPE html>
+<!--
+Copyright (c) 2010 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+-->
 <html>
 <head>
 <title></title>
diff --git a/chrome/browser/resources/gpu_internals/simulated_trace_data.js b/chrome/browser/resources/gpu_internals/simulated_trace_data.js
new file mode 100644
index 0000000..70625c4
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/simulated_trace_data.js
@@ -0,0 +1,30 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function getTimelineTestData1() {
+  return 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+}
+
+function getTimelineTestData2() {
+  return [
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':826,'ph':'B','name':'A','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':827,'ph':'B','name':'Asub','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':828,'ph':'E','name':'Asub','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':829,'ph':'B','name':'Asub','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':832,'ph':'E','name':'Asub','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':833,'ph':'E','name':'','args':{}},
+
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':840,'ph':'B','name':'A','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':848,'ph':'E','name':'A','args':{}},
+
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':850,'ph':'B','name':'B','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22630,'ts':854,'ph':'E','name':'B','args':{}},
+
+        {'cat':'PERF','pid':22630,'tid':22631,'ts':827,'ph':'B','name':'A','args':{}},
+        {'cat':'PERF','pid':22630,'tid':22631,'ts':854,'ph':'E','name':'A','args':{}}
+      ];
+
+
+}
+
diff --git a/chrome/browser/resources/gpu_internals/sorted_array_utils.js b/chrome/browser/resources/gpu_internals/sorted_array_utils.js
new file mode 100644
index 0000000..edb4349
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/sorted_array_utils.js
@@ -0,0 +1,157 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview Helper functions for doing intersections and iteration
+ * over sorted arrays and intervals.
+ *
+ */
+cr.define('gpu', function() {
+  /**
+   * Finds the first index in the array whose value is >= loVal.
+   *
+   * The key for the search is defined by the mapFn. This array must
+   * be prearranged such that ary.map(mapFn) would also be sorted in
+   * ascending order.
+   *
+   * @param {Array} ary An array of arbitrary objects.
+   * @param {function():*} mapFn Callback that produces a key value
+   *     from an element in ary.
+   * @param {number} loVal Value for which to search.
+   * @return {Number} Offset o into ary where all ary[i] for i <= o
+   *     are < loVal, or ary.length if loVal is greater than all elements in
+   *     the array.
+   */
+  function findLowIndexInSortedArray(ary, mapFn, loVal) {
+    if (ary.length == 0)
+      return 1;
+
+    var low = 0;
+    var high = ary.length - 1;
+    var i, comparison;
+    var hitPos = -1;
+    while (low <= high) {
+      i = Math.floor((low + high) / 2);
+      comparison = mapFn(ary[i]) - loVal;
+      if (comparison < 0) {
+        low = i + 1; continue;
+      } else if (comparison > 0) {
+        high = i - 1; continue;
+      } else {
+        hitPos = i;
+        high = i - 1;
+      }
+    }
+    // return where we hit, or failing that the low pos
+    return hitPos != -1 ? hitPos : low;
+  }
+
+  /**
+   * Finds an index in an array of intervals that either
+   * intersects the provided loVal, or if no intersection is found,
+   * the index of the first interval whose start is > loVal.
+   *
+   * The array of intervals is defined implicitly via two mapping functions
+   * over the provided ary. mapLoFn determines the lower value of the interval,
+   * mapWidthFn the width. Intersection is lower-inclusive, e.g. [lo,lo+w).
+   *
+   * The array of intervals formed by this mapping must be non-overlapping and
+   * sorted in ascending order by loVal.
+   *
+   * @param {Array} ary An array of objects that can be converted into sorted
+   *     nonoverlapping ranges [x,y) using the mapLoFn and mapWidth.
+   * @param {function():*} mapLoFn Callback that produces the low value for the
+   *     interval represented by an  element in the array.
+   * @param {function():*} mapLoFn Callback that produces the width for the
+   *     interval represented by an  element in the array.
+   * @param {number} loVal The low value for the search.
+   * @return {Number} An index in the array that intersects or is first-above
+   *     loVal, -1 if none found and loVal is below than all the intervals,
+   *     ary.length if loVal is greater than all the intervals.
+   */
+  function findLowIndexInSortedIntervals(ary, mapLoFn, mapWidthFn, loVal) {
+    var first = findLowIndexInSortedArray(ary, mapLoFn, loVal);
+    if (first == 0) {
+      if (loVal >= mapLoFn(ary[0]) &&
+          loVal < mapLoFn(ary[0] + mapWidthFn(ary[0]))) {
+        return 0;
+      } else {
+        return -1;
+      }
+    } else if (first <= ary.length &&
+               loVal >= mapLoFn(ary[first - 1]) &&
+               loVal < mapLoFn(ary[first - 1]) + mapWidthFn(ary[first - 1])) {
+      return first - 1;
+    } else {
+      return ary.length;
+    }
+  }
+
+  /**
+   * Calls cb for all intervals in the implicit array of intervals
+   * defnied by ary, mapLoFn and mapHiFn that intersect the range
+   * [loVal,hiVal)
+   *
+   * This function uses the same scheme as findLowIndexInSortedArray
+   * to define the intervals. The same restrictions on sortedness and
+   * non-overlappingness apply.
+   *
+   * @param {Array} ary An array of objects that can be converted into sorted
+   * nonoverlapping ranges [x,y) using the mapLoFn and mapWidth.
+   * @param {function():*} mapLoFn Callback that produces the low value for the
+   * interval represented by an element in the array.
+   * @param {function():*} mapLoFn Callback that produces the width for the
+   * interval represented by an element in the array.
+   * @param {number} The low value for the search, inclusive.
+   * @param {number} loVal The high value for the search, non inclusive.
+   * @param {function():*} cb The function to run for intersecting intervals.
+   */
+  function iterateOverIntersectingIntervals(ary, mapLoFn, mapWidthFn, loVal,
+                                            hiVal, cb) {
+    if (loVal > hiVal) return;
+
+    var i = findLowIndexInSortedArray(ary, mapLoFn, loVal);
+    if (i == -1) {
+      return;
+    }
+    if (i > 0) {
+      var hi = mapLoFn(ary[i - 1]) + mapWidthFn(ary[i - 1]);
+      if (hi >= loVal) {
+        cb(ary[i - 1]);
+      }
+    }
+    if (i == ary.length) {
+      return;
+    }
+
+    for(var n = ary.length; i < n; i++) {
+      var lo = mapLoFn(ary[i]);
+      if (lo >= hiVal)
+        break;
+      cb(ary[i]);
+    }
+  }
+
+  /**
+   * Non iterative version of iterateOverIntersectingIntervals.
+   *
+   * @return {Array} Array of elements in ary that intersect loVal, hiVal.
+   */
+  function getIntersectingIntervals(ary, mapLoFn, mapWidthFn, loVal, hiVal) {
+    var tmp = [];
+    iterateOverIntersectingIntervals(ary, mapLoFn, mapWidthFn, loVal, hiVal,
+                                     function(d) {
+                                       tmp.push(d);
+                                     });
+    return tmp;
+  }
+
+  return {
+    findLowIndexInSortedArray: findLowIndexInSortedArray,
+    findLowIndexInSortedIntervals: findLowIndexInSortedIntervals,
+    iterateOverIntersectingIntervals: iterateOverIntersectingIntervals,
+    getIntersectingIntervals: getIntersectingIntervals
+  };
+});
diff --git a/chrome/browser/resources/gpu_internals/tab_control.css b/chrome/browser/resources/gpu_internals/tab_control.css
index 4d7b7f8..29c7538 100644
--- a/chrome/browser/resources/gpu_internals/tab_control.css
+++ b/chrome/browser/resources/gpu_internals/tab_control.css
@@ -28,7 +28,6 @@ found in the LICENSE file.
   -webkit-box-flex: 1;
   display: -webkit-box;
   -webkit-box-orient: vertical;
-  -webkit-box-pack: stretch;
   overflow: auto;
 }
 
diff --git a/chrome/browser/resources/gpu_internals/tab_control.js b/chrome/browser/resources/gpu_internals/tab_control.js
index 6c4a120..dcd3e0a 100644
--- a/chrome/browser/resources/gpu_internals/tab_control.js
+++ b/chrome/browser/resources/gpu_internals/tab_control.js
@@ -1,8 +1,9 @@
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+
 /**
- *
  * @fileoverview This implements a tab control.
  *
  * An individual tab within a tab control is, unsurprisingly, a Tab.
@@ -36,7 +37,7 @@ cr.define('gpu', function() {
   Tab.prototype = {
     __proto__: HTMLDivElement.prototype,
 
-    decorate : function() {
+    decorate: function() {
     }
   };
 
@@ -83,7 +84,7 @@ cr.define('gpu', function() {
       this.onTabChanged_();
     },
 
-    onTabChanged_ : function(e) {
+    onTabChanged_: function(e) {
       if (this.tab_) {
         this.textContent = this.tab_.label;
         this.selected = this.tab_.selected;
@@ -109,7 +110,7 @@ cr.define('gpu', function() {
   TabControl.prototype = {
     __proto__: HTMLDivElement.prototype,
 
-    selectedTab_ : null,
+    selectedTab_: null,
 
     /**
      * Initializes the tab control element.
@@ -137,7 +138,7 @@ cr.define('gpu', function() {
     /**
      * Adds an element to the tab control.
      */
-    addTab : function(tab) {
+    addTab: function(tab) {
       if (tab.parentNode == this.tabs_)
         throw Error('Tab is already part of this control.');
       if (!(tab instanceof Tab))
@@ -160,7 +161,7 @@ cr.define('gpu', function() {
      * Removes a tab from the tab control.
      * changing the selected tab if needed.
      */
-    removeTab : function(tab) {
+    removeTab: function(tab) {
       if (tab.parentNode != this.tabs_)
         throw new Error('Tab is not attached to this control.');
 
@@ -176,7 +177,7 @@ cr.define('gpu', function() {
 
       this.tabs_.removeChild(tab);
       tab.tabStripButton_.parentNode.removeChild(
-        tab.tabStripButton_);
+          tab.tabStripButton_);
     },
 
     /**
@@ -191,7 +192,7 @@ cr.define('gpu', function() {
      */
     set selectedTab(tab) {
       if (tab.parentNode != this.tabs_)
-        throw Error("Tab is not part of this TabControl.");
+        throw Error('Tab is not part of this TabControl.');
       tab.selected = true;
     },
 
@@ -243,7 +244,7 @@ cr.define('gpu', function() {
   };
 
   return {
-    Tab : Tab,
+    Tab: Tab,
     TabControl: TabControl
   };
-});
\ No newline at end of file
+});
diff --git a/chrome/browser/resources/gpu_internals/timeline.css b/chrome/browser/resources/gpu_internals/timeline.css
new file mode 100644
index 0000000..3de191b
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline.css
@@ -0,0 +1,51 @@
+/*
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+*/
+.timeline {
+  -webkit-user-select: none;
+}
+
+.timeline-track {
+  display: -webkit-box;
+  -webkit-box-orient: horizontal;
+  -webkit-box-align: stretch;
+  background-color: white;
+  padding-right: 5px;
+  margin: 0;
+  padding: 0;
+  height: 18px;
+}
+
+.timeline-drag-box-hidden {
+  display: none;
+}
+
+.timeline-drag-box {
+  position: fixed;
+  background-color: rgba(0, 0, 255, 0.25);
+  border: 1px solid rgb(0, 0, 96);
+}
+
+.timeline-track:not(:first-child) {
+  border-top: 1px solid #D0D0D0
+}
+
+.timeline-track-title {
+  text-align: right;
+  overflow: visible;
+  width: 150px;
+  padding-right: 5px;
+}
+
+.timeline-track-canvas-container {
+  -webkit-box-flex: 1;
+  width: 100%;
+}
+
+.timeline-track-canvas {
+  -webkit-box-flex: 1;
+  width: 100%;
+  height: 100%;
+}
diff --git a/chrome/browser/resources/gpu_internals/timeline.js b/chrome/browser/resources/gpu_internals/timeline.js
new file mode 100644
index 0000000..997cb9e
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline.js
@@ -0,0 +1,421 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview Interactive visualizaiton of TimelineModel objects
+ * based loosely on gantt charts. Each thread in the TimelineModel is given a
+ * set of TimelineTracks, one per subrow in the thread. The Timeline class
+ * acts as a controller, creating the individual tracks, while TimelineTracks
+ * do actual drawing.
+ *
+ * Visually, the Timeline produces (prettier) visualizations like the following:
+ *    Thread1:  AAAAAAAAAA         AAAAA
+ *                  BBBB              BB
+ *    Thread2:     CCCCCC                 CCCCC
+ *
+ */
+cr.define('gpu', function() {
+
+  /**
+   * The TimelineViewport manages the transform used for navigating
+   * within the timeline. It is a simple transform:
+   *   x' = (x+pan) * scale
+   *
+   * The timeline code tries to avoid directly accessing this transform,
+   * instead using this class to do conversion between world and view space,
+   * as well as the math for centering the viewport in various interesting
+   * ways.
+   *
+   * @constructor
+   * @extends {cr.EventTarget}
+   */
+  function TimelineViewport() {
+    this.scaleX_ = 1;
+    this.panX_ = 0;
+  }
+
+  TimelineViewport.prototype = {
+    __proto__: cr.EventTarget.prototype,
+
+    get scaleX() {
+      return this.scaleX_;
+    },
+    set scaleX(s) {
+      var changed = this.scaleX_ != s;
+      if (changed) {
+        this.scaleX_ = s;
+        cr.dispatchSimpleEvent(this, 'change');
+      }
+    },
+
+    get panX() {
+      return this.panX_;
+    },
+    set panX(p) {
+      var changed = this.panX_ != p;
+      if (changed) {
+        this.panX_ = p;
+        cr.dispatchSimpleEvent(this, 'change');
+      }
+    },
+
+    setPanAndScale: function(p, s) {
+      var changed = this.scaleX_ != s || this.panX_ != p;
+      if (changed) {
+        this.scaleX_ = s;
+        this.panX_ = p;
+        cr.dispatchSimpleEvent(this, 'change');
+      }
+    },
+
+    xWorldToView: function(x) {
+      return (x + this.panX_) * this.scaleX_;
+    },
+
+    xWorldVectorToView: function(x) {
+      return x * this.scaleX_;
+    },
+
+    xViewToWorld: function(x) {
+      return (x / this.scaleX_) - this.panX_;
+    },
+
+    xViewVectorToWorld: function(x) {
+      return x / this.scaleX_;
+    },
+
+    xPanWorldPosToViewPos: function(worldX, viewX, viewWidth) {
+      if (typeof viewX == 'string') {
+        if (viewX == 'left') {
+          viewX = 0;
+        } else if (viewX == 'center') {
+          viewX = viewWidth / 2;
+        } else if (viewX == 'right') {
+          viewX = viewWidth - 1;
+        } else {
+          throw Error('unrecognized string for viewPos. left|center|right');
+        }
+      }
+      this.panX = (viewX / this.scaleX_) - worldX;
+    },
+
+    applyTransformToCanavs: function(ctx) {
+      ctx.transform(this.scaleX_, 0, 0, 1, this.panX_ * this.scaleX_, 0);
+    }
+  };
+
+  /**
+   * Renders a TimelineModel into a div element, making one
+   * TimelineTrack for each subrow in each thread of the model, managing
+   * overall track layout, and handling user interaction with the
+   * viewport.
+   *
+   * @constructor
+   * @extends {HTMLDivElement}
+   */
+  Timeline = cr.ui.define('div');
+
+  Timeline.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    model_: null,
+
+    decorate: function() {
+      this.classList.add('timeline');
+      this.needsViewportReset_ = false;
+
+      this.viewport_ = new TimelineViewport();
+      this.viewport_.addEventListener('change', this.invalidate.bind(this));
+
+      this.invalidatePending_ = false;
+
+      this.tracks_ = this.ownerDocument.createElement('div');
+      this.tracks_.invalidate = this.invalidate.bind(this);
+      this.appendChild(this.tracks_);
+
+      this.dragBox_ = this.ownerDocument.createElement('div');
+      this.dragBox_.className = 'timeline-drag-box timeline-drag-box-hidden';
+      this.appendChild(this.dragBox_);
+
+      // The following code uses a setInterval to monitor the timeline control
+      // for size changes. This is so that we can keep the canvas' bitmap size
+      // correctly synchronized with its presentation size.
+      // TODO(nduca): detect this in a more efficient way, e.g. iframe hack.
+      this.lastSize_ = this.clientWidth + 'x' + this.clientHeight;
+      this.ownerDocument.defaultView.setInterval(function() {
+        var curSize = this.clientWidth + 'x' + this.clientHeight;
+        if (this.clientWidth && curSize != this.lastSize_) {
+          this.lastSize_ = curSize;
+          this.onResize();
+        }
+      }.bind(this), 250);
+
+      document.addEventListener('keypress', this.onKeypress_.bind(this));
+      this.addEventListener('mousedown', this.onMouseDown_.bind(this));
+      this.addEventListener('mousemove', this.onMouseMove_.bind(this));
+      this.addEventListener('mouseup', this.onMouseUp_.bind(this));
+      this.lastMouseViewPos_ = {x: 0, y: 0};
+
+      this.selection_ = [];
+    },
+
+    get model() {
+      return this.model_;
+    },
+
+    set model(model) {
+      if (!model)
+        throw Error('Model cannot be null');
+      if (this.model) {
+        throw Error('Cannot set model twice.');
+      }
+      this.model_ = model;
+
+      // Create tracks.
+      this.tracks_.textContent = '';
+      var threads = model.getAllThreads();
+      for (var tI = 0; tI < threads.length; tI++) {
+        var thread = threads[tI];
+        for (var srI = 0; srI < thread.subRows.length; ++srI) {
+          var track = document.createElement('div');
+          cr.ui.decorate(track, gpu.TimelineTrack);
+          track.viewport = this.viewport_;
+          if (srI == 0)
+            track.heading = thread.parent.pid + ': ' + thread.tid + ': ';
+          else
+            track.heading = '';
+          track.slices = thread.subRows[srI];
+          track.thread = thread;
+          this.tracks_.appendChild(track);
+        }
+      }
+
+      this.needsViewportReset_ = true;
+    },
+
+    invalidate: function() {
+      if (this.invalidatePending_)
+        return;
+      this.invalidatePending_ = true;
+      window.setTimeout(function() {
+        this.invalidatePending_ = false;
+        this.redrawAllTracks_();
+      }.bind(this), 0);
+    },
+
+    onResize: function() {
+      for (var i = 0; i < this.tracks_.children.length; ++i) {
+        var track = this.tracks_.children[i];
+        track.onResize();
+      }
+    },
+
+    redrawAllTracks_: function() {
+      if (this.needsViewportReset_ && this.clientWidth != 0) {
+        this.needsViewportReset_ = false;
+        console.log('viewport was reset.');
+        /* update viewport */
+        var rangeTimestamp = this.model_.maxTimestamp -
+            this.model_.minTimestamp;
+        var w = this.tracks_.firstChild.getCanvasWidth();
+        var scaleX = w / rangeTimestamp;
+        var panX = -this.model_.minTimestamp;
+        this.viewport_.setPanAndScale(panX, scaleX);
+      }
+      for (var i = 0; i < this.tracks_.children.length; ++i) {
+        this.tracks_.children[i].redraw();
+      }
+    },
+
+    updateChildViewports_: function() {
+      for (var cI = 0; cI < this.tracks_.children.length; ++cI) {
+        var child = this.tracks_.children[cI];
+        child.setViewport(this.panX, this.scaleX);
+      }
+    },
+
+    onKeypress_: function(e) {
+      var vp = this.viewport_;
+      if (this.firstCanvas) {
+        var viewWidth = this.firstCanvas.clientWidth;
+        var curMouseV, curCenterW;
+        switch (event.keyCode) {
+          case 101: // e
+            var vX = this.lastMouseViewPos_.x;
+            var wX = vp.xViewToWorld(this.lastMouseViewPos_.x);
+            var distFromCenter = vX - (viewWidth / 2);
+            var percFromCenter = distFromCenter / viewWidth;
+            var percFromCenterSq = percFromCenter * percFromCenter;
+            vp.xPanWorldPosToViewPos(wX, 'center', viewWidth);
+            break;
+          case 119:  // w
+            curMouseV = this.lastMouseViewPos_.x;
+            curCenterW = vp.xViewToWorld(curMouseV);
+            vp.scaleX = vp.scaleX * 1.5;
+            vp.xPanWorldPosToViewPos(curCenterW, curMouseV, viewWidth);
+            break;
+          case 115:  // s
+            curMouseV = this.lastMouseViewPos_.x;
+            curCenterW = vp.xViewToWorld(curMouseV);
+            vp.scaleX = vp.scaleX / 1.5;
+            vp.xPanWorldPosToViewPos(curCenterW, curMouseV, viewWidth);
+            break;
+          case 87:  // W
+            curMouseV = this.lastMouseViewPos_.x;
+            curCenterW = vp.xViewToWorld(curMouseV);
+            vp.scaleX = vp.scaleX * 10;
+            vp.xPanWorldPosToViewPos(curCenterW, curMouseV, viewWidth);
+            break;
+          case 83:  // S
+            curMouseV = this.lastMouseViewPos_.x;
+            curCenterW = vp.xViewToWorld(curMouseV);
+            vp.scaleX = vp.scaleX / 10;
+            vp.xPanWorldPosToViewPos(curCenterW, curMouseV, viewWidth);
+            break;
+          case 97:  // a
+            vp.panX += vp.xViewVectorToWorld(viewWidth * 0.1);
+            break;
+          case 100:  // d
+            vp.panX -= vp.xViewVectorToWorld(viewWidth * 0.1);
+            break;
+          case 65:  // A
+            vp.panX += vp.xViewVectorToWorld(viewWidth * 0.5);
+            break;
+          case 68:  // D
+            vp.panX -= vp.xViewVectorToWorld(viewWidth * 0.5);
+            break;
+        }
+      }
+    },
+
+    get selection() {
+      return this.selection_;
+    },
+
+    get firstCanvas() {
+      if (this.tracks_.firstChild)
+        return this.tracks_.firstChild.canvas;
+    },
+
+    showDragBox_: function() {
+      this.dragBox_.classList.remove('timeline-drag-box-hidden');
+    },
+
+    hideDragBox_: function() {
+      this.dragBox_.classList.add('timeline-drag-box-hidden');
+    },
+
+    setDragBoxPosition_: function(eDown, eCur) {
+      var loX = Math.min(eDown.clientX, eCur.clientX);
+      var hiX = Math.max(eDown.clientX, eCur.clientX);
+      var loY = Math.min(eDown.clientY, eCur.clientY);
+      var hiY = Math.max(eDown.clientY, eCur.clientY);
+
+      this.dragBox_.style.left = loX + 'px';
+      this.dragBox_.style.top = loY + 'px';
+      this.dragBox_.style.width = hiX - loX + 'px';
+      this.dragBox_.style.height = hiY - loY + 'px';
+
+      var canv = this.firstCanvas;
+      var loWX = this.viewport_.xViewToWorld(loX - canv.offsetLeft);
+      var hiWX = this.viewport_.xViewToWorld(hiX - canv.offsetLeft);
+      var e = new cr.Event('selectionChanging');
+      e.loWX = loWX;
+      e.hiWX = hiWX;
+      this.dispatchEvent(e);
+    },
+
+    onMouseDown_: function(e) {
+      var canv = this.firstCanvas;
+      var pos = {
+        x: e.clientX - canv.offsetLeft,
+        y: e.clientY - canv.offsetTop
+      };
+      var wX = this.viewport_.xViewToWorld(pos.x);
+
+      // Update the drag box position
+      this.showDragBox_();
+      this.setDragBoxPosition_(e, e);
+      this.dragBeginEvent_ = e;
+      e.preventDefault();
+    },
+
+    onMouseMove_: function(e) {
+      if (!this.firstCanvas)
+        return;
+      var canv = this.firstCanvas;
+      var pos = {
+        x: e.clientX - canv.offsetLeft,
+        y: e.clientY - canv.offsetTop
+      };
+
+      // Remember position. Used during keyboard zooming.
+      this.lastMouseViewPos_ = pos;
+
+      // Update the drag box
+      if (this.dragBeginEvent_) {
+        this.setDragBoxPosition_(this.dragBeginEvent_, e);
+      }
+    },
+
+    onMouseUp_: function(e) {
+      var i;
+      if (this.dragBeginEvent_) {
+        // Stop the dragging.
+        this.hideDragBox_();
+        var eDown = this.dragBeginEvent_;
+        this.dragBeginEvent_ = null;
+
+        // Figure out extents of the drag.
+        var loX = Math.min(eDown.clientX, e.clientX);
+        var hiX = Math.max(eDown.clientX, e.clientX);
+        var loY = Math.min(eDown.clientY, e.clientY);
+        var hiY = Math.max(eDown.clientY, e.clientY);
+
+        // Convert to worldspace.
+        var canv = this.firstCanvas;
+        var loWX = this.viewport_.xViewToWorld(loX - canv.offsetLeft);
+        var hiWX = this.viewport_.xViewToWorld(hiX - canv.offsetLeft);
+
+        // Clear old selection.
+        for (i = 0; i < this.selection_.length; ++i) {
+          this.selection_[i].slice.selected = false;
+        }
+        // Figure out what has been hit.
+        var selection = [];
+        function addHit(type, track, slice) {
+          selection.push({track: track, slice: slice});
+        }
+        for (i = 0; i < this.tracks_.children.length; ++i) {
+          var track = this.tracks_.children[i];
+
+          // Only check tracks that insersect the rect.
+          var a = Math.max(loY, track.offsetTop);
+          var b = Math.min(hiY, track.offsetTop + track.offsetHeight);
+          if (a <= b) {
+            track.pickRange(loWX, hiWX, addHit);
+          }
+        }
+        // Activate the new selection.
+        this.selection_ = selection;
+        cr.dispatchSimpleEvent(this, 'selectionChange');
+        for (i = 0; i < this.selection_.length; ++i) {
+          this.selection_[i].slice.selected = true;
+        }
+        this.invalidate();  // Cause tracks to redraw.
+      }
+    }
+  };
+
+  /**
+   * The TimelineModel being viewed by the timeline
+   * @type {TimelineModel}
+   */
+  cr.defineProperty(Timeline, 'model', cr.PropertyKind.JS);
+
+  return {
+    Timeline: Timeline
+  };
+});
diff --git a/chrome/browser/resources/gpu_internals/timeline_model.js b/chrome/browser/resources/gpu_internals/timeline_model.js
new file mode 100644
index 0000000..2196c11
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline_model.js
@@ -0,0 +1,249 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview TimelineModel is a parsed representation of the
+ * TraceEvents obtained from base/trace_event in which the begin-end
+ * tokens are converted into a hierarchy of processes, threads,
+ * subrows, and slices.
+ *
+ * The building block of the model is a slice. A slice is roughly
+ * equivalent to function call executing on a specific thread. As a
+ * result, slices may have one or more subslices.
+ *
+ * A thread contains one or more subrows of slices. Row 0 corresponds to
+ * the "root" slices, e.g. the topmost slices. Row 1 contains slices that
+ * are nested 1 deep in the stack, and so on. We use these subrows to draw
+ * nesting tasks.
+ *
+ */
+cr.define('gpu', function() {
+  /**
+   * A TimelineSlice represents an interval of time on a given thread
+   * associated with a specific trace event. For example,
+   *   TRACE_EVENT_BEGIN1("x","myArg", 7) at time=0.1ms
+   *   TRACE_EVENT_END()                  at time=0.3ms
+   * Results in a single timeline slice from 0.1 with duration 0.2.
+   *
+   * All time units are stored in milliseconds.
+   * @constructor
+   */
+  function TimelineSlice(title, colorId, start, args) {
+    this.title = title;
+    this.start = start;
+    this.colorId = colorId;
+    this.args = args;
+    this.subSlices = [];
+  }
+
+  TimelineSlice.prototype = {
+    selected: false,
+
+    duration: undefined,
+
+    get end() {
+      return this.start + this.duration;
+    }
+  };
+
+  /**
+   * A TimelineThread stores all the trace events collected for a particular
+   * thread. We organize the slices on a thread by "subrows," where subrow 0
+   * has all the root slices, subrow 1 those nested 1 deep, and so on.
+   *
+   * @constructor
+   */
+  function TimelineThread(parent, tid) {
+    this.parent = parent;
+    this.tid = tid;
+    this.subRows = [[]];
+  }
+
+  TimelineThread.prototype = {
+    getSubrow: function(i) {
+      while (i >= this.subRows.length)
+        this.subRows.push([]);
+      return this.subRows[i];
+    },
+
+    updateBounds: function() {
+      var slices = this.subRows[0];
+      if (slices.length != 0) {
+        this.minTimestamp = slices[0].start;
+        this.maxTimestamp = slices[slices.length - 1].end;
+      } else {
+        this.minTimestamp = undefined;
+        this.maxTimestamp = undefined;
+      }
+    }
+
+  };
+
+  /**
+   * The TimelineProcess represents a single process in the
+   * trace. Right now, we keep this around purely for bookkeeping
+   * reasons.
+   * @constructor
+   */
+  function TimelineProcess(pid) {
+    this.pid = pid;
+    this.threads = {};
+  };
+
+  TimelineProcess.prototype = {
+    getThread: function(tid) {
+      if (!this.threads[tid])
+        this.threads[tid] = new TimelineThread(this, tid);
+      return this.threads[tid];
+    }
+  };
+
+  /**
+   * Builds a model from an array of TraceEvent objects.
+   * @param {Array} events An array of TraceEvents created by
+   *     TraceEvent.ToJSON().
+   * @constructor
+   */
+  function TimelineModel(events) {
+    this.processes = {};
+
+    this.importEvents(events);
+  }
+
+  TimelineModel.prototype = {
+    __proto__: cr.EventTarget.prototype,
+
+    getProcess: function(pid) {
+      if (!this.processes[pid])
+        this.processes[pid] = new TimelineProcess(pid);
+      return this.processes[pid];
+    },
+
+    /**
+     * The import takes an array of json-ified TraceEvents and adds them into
+     * the TimelineModel as processes, threads, and slices.
+     */
+    importEvents: function(events) {
+      // A ptid is a pid and tid joined together x:y fashion, eg 1024:130
+      // The ptid is a unique key for a thread in the trace.
+
+
+      // Threadstate
+      const numColorIds = 12;
+      function ThreadState(tid) {
+        this.openSlices = [];
+      }
+      var threadStateByPTID = {};
+
+      var nameToColorMap = {};
+      var nextColorId = 0;
+      function getColor(name) {
+        if (!(name in nameToColorMap)) {
+          nameToColorMap[name] = nextColorId;
+          nextColorId = (nextColorId + 1) % numColorIds;
+        }
+        return nameToColorMap[name];
+      }
+
+      // Walk through events
+      for (var eI = 0; eI < events.length; eI++) {
+        var event = events[eI];
+        var ptid = event.pid + ':' + event.tid;
+        if (!(ptid in threadStateByPTID)) {
+          threadStateByPTID[ptid] = new ThreadState();
+        }
+        var state = threadStateByPTID[ptid];
+        if (event.ph == 'B') {
+          var colorId = getColor(event.name);
+          var slice = new TimelineSlice(event.name, colorId, event.ts,
+                                        event.args);
+          state.openSlices.push(slice);
+        } else if (event.ph == 'E') {
+          if (state.openSlices.length == 0) {
+            // Ignore E events that that are unmatched.
+            continue;
+          }
+          var slice = state.openSlices.pop();
+          slice.duration = event.ts - slice.start;
+
+          // Store the slice on the right subrow.
+          var thread = this.getProcess(event.pid).getThread(event.tid);
+          var subRowIndex = state.openSlices.length;
+          thread.getSubrow(subRowIndex).push(slice);
+
+          // Add the slice to the subSlices array of its parent.
+          if (state.openSlices.length) {
+            var parentSlice = state.openSlices[state.openSlices.length - 1];
+            parentSlice.subSlices.push(slice);
+          }
+        } else if (event.ph == 'I') {
+          // TODO(nduca): Implement parsing of immediate events.
+          console.log('Parsing of I-type events not implemented.');
+        } else {
+          throw new Error('Unrecognized event phase: ' + event.ph +
+                          '(' + event.name + ')');
+        }
+      }
+      this.updateBounds();
+
+      this.shiftWorldToMicroseconds();
+
+      var boost = (this.maxTimestamp - this.minTimestamp) * 0.15;
+      this.minTimestamp = this.minTimestamp - boost;
+      this.maxTimestamp = this.maxTimestamp + boost;
+    },
+
+    updateBounds: function() {
+      var wmin = Infinity;
+      var wmax = -wmin;
+      var threads = this.getAllThreads();
+      for (var tI = 0; tI < threads.length; tI++) {
+        var thread = threads[tI];
+        thread.updateBounds();
+        wmin = Math.min(wmin, thread.minTimestamp);
+        wmax = Math.max(wmax, thread.maxTimestamp);
+      }
+      this.minTimestamp = wmin;
+      this.maxTimestamp = wmax;
+    },
+
+    shiftWorldToMicroseconds: function() {
+      var timeBase = this.minTimestamp;
+      var threads = this.getAllThreads();
+      for (var tI = 0; tI < threads.length; tI++) {
+        var thread = threads[tI];
+        for (var tSR = 0; tSR < thread.subRows.length; tSR++) {
+          var subRow = thread.subRows[tSR];
+          for (var tS = 0; tS < subRow.length; tS++) {
+            var slice = subRow[tS];
+            slice.start = (slice.start - timeBase) / 1000;
+            slice.duration /= 1000;
+          }
+        }
+      }
+
+      this.updateBounds();
+    },
+
+    getAllThreads: function() {
+      var threads = [];
+      for (var pid in this.processes) {
+        var process = this.processes[pid];
+        for (var tid in process.threads) {
+          threads.push(process.threads[tid]);
+        }
+      }
+      return threads;
+    }
+
+  };
+
+  return {
+    TimelineSlice: TimelineSlice,
+    TimelineThread: TimelineThread,
+    TimelineProcess: TimelineProcess,
+    TimelineModel: TimelineModel
+  };
+});
diff --git a/chrome/browser/resources/gpu_internals/timeline_track.js b/chrome/browser/resources/gpu_internals/timeline_track.js
new file mode 100644
index 0000000..3a4c737
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline_track.js
@@ -0,0 +1,186 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview Renders an array of slices into the provided div,
+ * using a child canvas element. Uses a FastRectRenderer to draw only
+ * the visible slices.
+ */
+cr.define('gpu', function() {
+
+  const palletteBase = [
+    {r: 0x45, g: 0x85, b: 0xaa},
+    {r: 0xdc, g: 0x73, b: 0xa8},
+    {r: 0x77, g: 0xb6, b: 0x94},
+    {r: 0x23, g: 0xae, b: 0x6e},
+    {r: 0x76, g: 0x5d, b: 0x9e},
+    {r: 0x48, g: 0xd8, b: 0xfb},
+    {r: 0xa9, g: 0xd7, b: 0x93},
+    {r: 0x7c, g: 0x2d, b: 0x52},
+    {r: 0x69, g: 0xc2, b: 0x75},
+    {r: 0x76, g: 0xcf, b: 0xee},
+    {r: 0x3d, g: 0x85, b: 0xd1},
+    {r: 0x71, g: 0x0b, b: 0x54}];
+
+  function brighten(c) {
+    return {r: Math.min(255, c.r + Math.floor(c.r * 0.45)),
+      g: Math.min(255, c.g + Math.floor(c.g * 0.45)),
+      b: Math.min(255, c.b + Math.floor(c.b * 0.45))};
+  }
+  function colorToString(c) {
+    return 'rgb(' + c.r + ',' + c.g + ',' + c.b + ')';
+  }
+
+  const selectedIdBoost = palletteBase.length;
+
+  const pallette = palletteBase.concat(palletteBase.map(brighten)).
+      map(colorToString);
+
+  /**
+   * Creates a new timeline track div element
+   * @constructor
+   * @extends {HTMLDivElement}
+   */
+  TimelineTrack = cr.ui.define('div');
+
+  TimelineTrack.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    decorate: function() {
+      this.classList.add('timeline-track');
+      this.slices_ = null;
+
+      this.titleDiv_ = document.createElement('div');
+      this.titleDiv_.className = 'timeline-track-title';
+      this.appendChild(this.titleDiv_);
+
+      this.canvasContainer_ = document.createElement('div');
+      this.canvasContainer_.className = 'timeline-track-canvas-container';
+      this.appendChild(this.canvasContainer_);
+      this.canvas_ = document.createElement('canvas');
+      this.canvas_.className = 'timeline-track-canvas';
+      this.canvasContainer_.appendChild(this.canvas_);
+
+      this.ctx_ = this.canvas_.getContext('2d');
+    },
+
+    set heading(text) {
+      this.titleDiv_.textContent = text;
+    },
+
+    set slices(slices) {
+      this.slices_ = slices;
+      this.invalidate();
+    },
+    get canvas() {
+      return this.canvas_;
+    },
+
+    onResize: function() {
+      this.canvas_.width = this.canvasContainer_.clientWidth;
+      this.canvas_.height = this.canvasContainer_.clientHeight;
+      this.invalidate();
+    },
+
+    invalidate: function() {
+      if (this.parentNode)
+        this.parentNode.invalidate();
+    },
+
+    set viewport(v) {
+      this.viewport_ = v;
+      this.invalidate();
+    },
+
+    getCanvasWidth: function() {
+      return this.canvas_.width;
+    },
+
+    redraw: function() {
+      if (!this.viewport_)
+        return;
+      var ctx = this.ctx_;
+      var canvasW = this.canvas_.width;
+      var canvasH = this.canvas_.height;
+
+      ctx.clearRect(0, 0, canvasW, canvasH);
+
+      // culling...
+      var vp = this.viewport_;
+      var pixWidth = vp.xViewVectorToWorld(1);
+      var viewLWorld = vp.xViewToWorld(0);
+      var viewRWorld = vp.xViewToWorld(this.width);
+
+      // begin rendering in world space
+      ctx.save();
+      vp.applyTransformToCanavs(ctx);
+
+      // tracks
+      var tr = new gpu.FastRectRenderer(ctx, viewLWorld, 2 * pixWidth,
+                                        2 * pixWidth, viewRWorld, pallette);
+      tr.setYandH(0, canvasH);
+      var slices = this.slices_;
+      for (var i = 0; i < slices.length; ++i) {
+        var slice = slices[i];
+        var x = slice.start;
+        var w = slice.duration;
+        var colorId;
+        colorId = slice.selected ?
+            slice.colorId + selectedIdBoost :
+            slice.colorId;
+
+        if (w < pixWidth)
+          w = pixWidth;
+        tr.fillRect(x, w, colorId);
+      }
+      tr.flush();
+      ctx.restore();
+    },
+
+    /**
+     * Picks a slice, if any, at a given location.
+     * @param {number} wX Location to search at, in worldspace.
+     * @param {function():*} onHitCallback Callback to call with the slice,
+     *     if one is found.
+     * @return {boolean} true if a slice was found, otherwise false.
+     */
+    pick: function(wX, onHitCallback) {
+      var x = gpu.findLowIndexInSortedIntervals(this.slices_,
+          function(x) { return x.start; },
+          function(x) { return x.duration; },
+          wX);
+      if (x >= 0 && x < this.slices_.length) {
+        onHitCallback('slice', this, this.slices_[x]);
+        return true;
+      }
+      return false;
+    },
+
+    /**
+     * Finds slices intersecting the given interval.
+     * @param {number} loWX Lower bound of the interval to search, in
+     *     worldspace.
+     * @param {number} hiWX Upper bound of the interval to search, in
+     *     worldspace.
+     * @param {function():*} onHitCallback Function to call for each slice
+     *     intersecting the interval.
+     */
+    pickRange: function(loWX, hiWX, onHitCallback) {
+      function onPickHit(slice) {
+        onHitCallback('slice', this, slice);
+      }
+      gpu.iterateOverIntersectingIntervals(this.slices_,
+          function(x) { return x.start; },
+          function(x) { return x.duration; },
+          loWX, hiWX,
+          onPickHit);
+    }
+
+  };
+
+  return {
+    TimelineTrack: TimelineTrack
+  };
+});
diff --git a/chrome/browser/resources/gpu_internals/timeline_view.css b/chrome/browser/resources/gpu_internals/timeline_view.css
new file mode 100644
index 0000000..90d3a4a
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline_view.css
@@ -0,0 +1,35 @@
+/*
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+*/
+#timeline-view {
+  padding: 0px;
+  -webkit-box-orient: vertical;
+  -webkit-box-flex: 1;
+}
+
+#timeline-view[selected] {
+  display: -webkit-box;
+}
+
+#timeline-view-timeline-container {
+  display: -webkit-box;
+  -webkit-box-flex: 1;
+  overflow: auto;
+}
+
+#timeline-view-timeline-container > .timeline {
+  -webkit-box-flex: 1;
+}
+
+#timeline-selection-summary {
+  border-top: 1px solid black;
+  max-height: 300px;
+  min-height: 100px;
+  font-family: monospace;
+}
+
+#timeline-selection-summary ul {
+  margin: 0px;
+}
\ No newline at end of file
diff --git a/chrome/browser/resources/gpu_internals/timeline_view.html b/chrome/browser/resources/gpu_internals/timeline_view.html
new file mode 100644
index 0000000..e908dca
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline_view.html
@@ -0,0 +1,11 @@
+<!--
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+-->
+<div id="timeline-view" label="Timeline">
+  <div id="timeline-view-timeline-container">
+  </div>
+  <pre id="timeline-selection-summary">
+  </pre>
+</div>
diff --git a/chrome/browser/resources/gpu_internals/timeline_view.js b/chrome/browser/resources/gpu_internals/timeline_view.js
new file mode 100644
index 0000000..d0a3a4f
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/timeline_view.js
@@ -0,0 +1,131 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview TimelineView visualizes GPU_TRACE events using the
+ * gpu.Timeline component.
+ */
+cr.define('gpu', function() {
+  function tsRound(ts) {
+    return Math.round(ts * 100.0) / 100.0;
+  }
+
+  /**
+   * TimelineView
+   * @constructor
+   * @extends {gpu.Tab}
+   */
+  TimelineView = cr.ui.define(gpu.Tab);
+
+  TimelineView.prototype = {
+    __proto__: gpu.Tab.prototype,
+
+    decorate: function() {
+      tracingController.addEventListener('traceBegun', this.refresh.bind(this));
+      tracingController.addEventListener('traceEnded', this.refresh.bind(this));
+      this.addEventListener('selectedChange', this.onViewSelectedChange_);
+
+      this.refresh();
+    },
+
+    onViewSelectedChange_: function() {
+      if (this.selected) {
+        if (tracingController.traceEvents.length == 0) {
+          tracingController.beginTracing();
+        }
+        if (this.needsRefreshOnShow_) {
+          this.needsRefreshOnShow_ = false;
+          this.refresh();
+        }
+      }
+    },
+
+    /**
+     * Updates the view based on its currently known data
+     */
+    refresh: function() {
+      if (this.parentNode.selectedTab != this) {
+        this.needsRefreshOnShow_ = true;
+      }
+
+      console.log('TimelineView.refresh');
+      var events = tracingController.traceEvents;
+      this.timelineModel_ = new gpu.TimelineModel(events);
+
+      // remove old timeline
+      var timelineContainer = $('timeline-view-timeline-container');
+      timelineContainer.textContent = '';
+
+      // create new timeline if needed
+      if (events.length) {
+        this.timeline_ = new gpu.Timeline();
+        this.timeline_.model = this.timelineModel_;
+        timelineContainer.appendChild(this.timeline_);
+        this.timeline_.onResize();
+        this.timeline_.addEventListener('selectionChanging',
+                                        this.onSelectionChanging_.bind(this));
+        this.timeline_.addEventListener('selectionChange',
+                                        this.onSelectionChanged_.bind(this));
+      } else {
+        this.timeline_ = null;
+      }
+    },
+    onSelectionChanging_: function(e) {
+      var text =
+          'Start:    ' + tsRound(e.loWX) + 'ms\n' +
+          'End:      ' + tsRound(e.hiWX) + 'ms\n' +
+          'Duration: ' + tsRound(e.hiWX - e.loWX) + 'ms\n';
+      var outputElem = $('timeline-selection-summary');
+      outputElem.textContent = text;
+    },
+
+    onSelectionChanged_: function(e) {
+      var timeline = this.timeline_;
+      var selection = timeline.selection;
+      if (!selection.length) {
+        var outputDiv = $('timeline-selection-summary');
+        outputDiv.textContent = '';
+        return;
+      }
+
+      var text = '';
+      var tsLo = Math.min.apply(Math, selection.map(
+          function(s) {return s.slice.start;}));
+      var tsHi = Math.max.apply(Math, selection.map(
+          function(s) {return s.slice.end;}));
+
+      text += 'Start:    ' + tsRound(tsLo) + 'ms<br>';
+      text += 'Duration: ' + tsRound(tsHi - tsLo) + 'ms<br>';
+
+      // compute total selection duration
+      var titles = selection.map(function(i) { return i.slice.title; });
+      text += '<ul>';
+      var slicesByTitle = {};
+      for (var i = 0; i < selection.length; i++) {
+        var slice = selection[i].slice;
+        if (!slicesByTitle[slice.title])
+          slicesByTitle[slice.title] = {
+            slices: []
+          };
+        slicesByTitle[slice.title].slices.push(slice);
+      }
+      for (var sliceGroupTitle in slicesByTitle) {
+        var sliceGroup = slicesByTitle[sliceGroupTitle];
+        text += '<li>' +
+            sliceGroupTitle + ': ' + sliceGroup.slices.length +
+            '</li>';
+      }
+      text += '</ul>';
+
+      // done
+      var outputDiv = $('timeline-selection-summary');
+      outputDiv.innerHTML = text;
+    }
+  };
+
+  return {
+    TimelineView: TimelineView
+  };
+});
diff --git a/chrome/browser/resources/gpu_internals/tracing_controller.css b/chrome/browser/resources/gpu_internals/tracing_controller.css
new file mode 100644
index 0000000..331fe85
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/tracing_controller.css
@@ -0,0 +1,33 @@
+/*
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+*/
+.gpu-tracing-overlay {
+  text-align: center;
+  display: -webkit-box;
+  width: 200px;
+  height: 80px;
+  -webkit-box-orient: vertical;
+  -webkit-box-pack: center;
+  -webkit-box-align: center;
+}
+
+.gpu-tracing-start-button {
+  position: fixed;
+  right: 3px;
+  top: -1px;
+  -webkit-margin-start: 5px;
+  text-decoration: none;
+  text-align: center;
+  display: inline-block;
+  margin-top: 4px;
+  padding: 5px 10px 3px 10px;
+  border-top-right-radius: 8px;
+  border-top-left-radius: 8px;
+  background-clip: border-box;
+  background: rgb(255,0,0);
+  border-left: 1px solid black;
+  border-top: 1px solid black;
+  border-right: 1px solid black;
+}
diff --git a/chrome/browser/resources/gpu_internals/tracing_controller.html b/chrome/browser/resources/gpu_internals/tracing_controller.html
new file mode 100644
index 0000000..7db2635
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/tracing_controller.html
@@ -0,0 +1,14 @@
+<!--
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+-->
+<div hidden>
+  <div id="gpu-tracing-start-button-template" class="gpu-tracing-start-button">
+    Record new data
+  </div>
+  <div id="gpu-tracing-overlay-template" class="gpu-tracing-overlay">
+    <div class="gpu-tracing-status">Tracing active.</div>
+    <button class="gpu-tracing-stop-button">Stop tracing</button>
+  </div>
+</div>
diff --git a/chrome/browser/resources/gpu_internals/tracing_controller.js b/chrome/browser/resources/gpu_internals/tracing_controller.js
new file mode 100644
index 0000000..f46e417
--- /dev/null
+++ b/chrome/browser/resources/gpu_internals/tracing_controller.js
@@ -0,0 +1,127 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview State and UI for trace data collection.
+ */
+cr.define('gpu', function() {
+  function TracingController() {
+    this.overlay_ = $('gpu-tracing-overlay-template').cloneNode(true);
+    this.overlay_.removeAttribute('id');
+    cr.ui.decorate(this.overlay_, gpu.Overlay);
+
+    this.traceEvents_ = [];
+
+    var startButton = $('gpu-tracing-start-button-template').cloneNode(true);
+    startButton.removeAttribute('id');
+    document.body.appendChild(startButton);
+    startButton.onclick = this.beginTracing.bind(this);
+
+    var stopButton = this.overlay_.querySelector('.gpu-tracing-stop-button');
+    stopButton.onclick = this.endTracing.bind(this);
+  }
+
+  TracingController.prototype = {
+    __proto__: cr.EventTarget.prototype,
+
+    tracingEnabled_: false,
+
+    /**
+     * Called by info_view to empty the trace buffer
+     */
+    beginTracing: function() {
+      if (this.tracingEnabled_)
+        throw Error('Tracing already begun.');
+
+      this.overlay_.visible = true;
+
+      this.tracingEnabled_ = true;
+      console.log('Beginning to trace...');
+
+      this.traceEvents_ = [];
+      if (!browserBridge.debugMode)
+        chrome.send('beginTracing');
+
+      this.tracingEnabled_ = true;
+
+      var e = new cr.Event('traceBegun');
+      e.events = this.traceEvents_;
+      this.dispatchEvent(e);
+
+      e = new cr.Event('traceEventsChanged');
+      e.numEvents = this.traceEvents_.length;
+      this.dispatchEvent(e);
+
+      var self = this;
+      window.addEventListener('keypress', function f(e) {
+        if (e.keyIdentifier == 'Enter') {
+          window.removeEventListener('keypress', f);
+          self.endTracing();
+        }
+      });
+    },
+
+    /**
+     * Checks whether tracing is enabled
+     */
+    get isTracingEnabled() {
+      return this.tracingEnabled_;
+    },
+
+    /**
+     * Gets the currently traced events. If tracing is active, then
+     * this can change on the fly.
+     */
+    get traceEvents() {
+      return this.traceEvents_;
+    },
+
+    /**
+     * Callbed by gpu c++ code when new GPU trace data arrives.
+     */
+    onTraceDataCollected: function(events) {
+      this.traceEvents_.push.apply(this.traceEvents_, events);
+    },
+
+    /**
+     * Called by info_view to finish tracing and update all views.
+     */
+    endTracing: function() {
+      if (!this.tracingEnabled_) throw new Error('Tracing not begun.');
+
+      console.log('Finishing trace');
+      if (!browserBridge.debugMode) {
+        chrome.send('beginToEndTracing');
+      } else {
+        var events = getTimelineTestData1();
+        this.onTraceDataCollected(events);
+        window.setTimeout(this.onEndTracingComplete.bind(this), 250);
+      }
+    },
+
+    /**
+     * Called by the browser when all processes ack tracing
+     * having completed.
+     */
+    onEndTracingComplete: function() {
+      this.overlay_.visible = false;
+      this.tracingEnabled_ = false;
+      console.log('onEndTracingComplete p1 with ' +
+                  this.traceEvents_.length + ' events.');
+      var e = new cr.Event('traceEnded');
+      e.events = this.traceEvents_;
+      this.dispatchEvent(e);
+    },
+
+    selfTest: function() {
+      this.beginTracing();
+      window.setTimeout(this.endTracing.bind(This), 500);
+    }
+  };
+  return {
+    TracingController: TracingController
+  };
+});
+