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diff --git a/chrome/browser/resources/net_internals/detailsview.js b/chrome/browser/resources/net_internals/detailsview.js
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+++ b/chrome/browser/resources/net_internals/detailsview.js
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+// 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.
+
+/**
+ * The DetailsView handles the tabbed view that displays either the "log" or
+ * "timeline" view. This class keeps track of what the current view is, and
+ * invalidates the specific view each time the selected data has changed.
+ *
+ * @constructor
+ */
+function DetailsView(logTabHandleId,
+                     timelineTabHandleId,
+                     detailsTabContentId) {
+  // The DOM nodes that which contain the tab title.
+  this.tabHandles_ = {};
+
+  this.tabHandles_['timeline'] = document.getElementById(timelineTabHandleId);
+  this.tabHandles_['log'] = document.getElementById(logTabHandleId);
+
+  // The DOM node that contains the currently active tab sheet.
+  this.contentArea_ = document.getElementById(detailsTabContentId);
+
+  // Attach listeners to the "tab handles" so when you click them, it switches
+  // active view.
+
+  var self = this;
+
+  this.tabHandles_['timeline'].onclick = function() {
+    self.switchToView_('timeline');
+  };
+
+  this.tabHandles_['log'].onclick = function() {
+    self.switchToView_('log');
+  };
+
+  this.currentData_ = [];
+
+  // Default to the log view.
+  this.switchToView_('log');
+};
+
+// The delay between updates to repaint.
+DetailsView.REPAINT_TIMEOUT_MS = 50;
+
+/**
+ * Switches to the tab with name |viewName|. (Either 'log' or 'timeline'.
+ */
+DetailsView.prototype.switchToView_ = function(viewName) {
+  if (this.currentView_) {
+    // Remove the selected styling on currently selected tab.
+    changeClassName(this.tabHandles_[this.currentView_], 'selected', false);
+  }
+
+  this.currentView_ = viewName;
+  changeClassName(this.tabHandles_[this.currentView_], 'selected', true);
+  this.repaint_();
+};
+
+/**
+ * Updates the data this view is using.
+ */
+DetailsView.prototype.setData = function(currentData) {
+  // Make a copy of the array (in case the caller mutates it), and sort it
+  // by the source ID.
+  this.currentData_ = DetailsView.createSortedCopy_(currentData);
+
+  // Invalidate the view.
+  if (!this.outstandingRepaint_) {
+    this.outstandingRepaint_ = true;
+    window.setTimeout(this.repaint_.bind(this),
+                      DetailsView.REPAINT_TIMEOUT_MS);
+  }
+};
+
+DetailsView.prototype.repaint_ = function() {
+  this.outstandingRepaint_ = false;
+  this.contentArea_.innerHTML = '';
+
+  if (this.currentView_ == 'log') {
+    PaintLogView(this.currentData_, this.contentArea_);
+  } else {
+    PaintTimelineView(this.currentData_, this.contentArea_);
+  }
+};
+
+DetailsView.createSortedCopy_ = function(origArray) {
+  var sortedArray = origArray.slice(0);
+  sortedArray.sort(function(a, b) {
+    return a.getSourceId() - b.getSourceId();
+  });
+  return sortedArray;
+};