Collect tab timing information for use in telementry-based startup tests

Motivation: Data collection exposed in this CL is needed by upcoming startup tests we're writing using Telemtry.

Expose a new window.statsCollectionController object to JS and move existing histogram reading code into it since that seemed misplaced in DOMAutomationController.

Add a new --enable-stats-collection-bindings to activate said object.

Example usage in telemtry:
with browser.Create() as b:
  b.tabs[0].Navigate("http://www.google.com")
  b.tabs[0].WaitForDocumentReadyStateToBeComplete()
  print b.tabs[0].EvaluateJavaScript('statsCollectionController.tabLoadTiming()')

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202620

Review URL: https://chromiumcodereview.appspot.com/12389073

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202955 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/content/renderer/stats_collection_controller.h b/content/renderer/stats_collection_controller.h
new file mode 100644
index 0000000..eb1ccb0
--- /dev/null
+++ b/content/renderer/stats_collection_controller.h
@@ -0,0 +1,43 @@
+// Copyright 2013 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.
+
+#ifndef CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
+#define CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
+
+#include "ipc/ipc_sender.h"
+#include "webkit/glue/cpp_bound_class.h"
+
+namespace content {
+
+// This class is exposed in JS as window.statsCollectionController and provides
+// functionality to read out statistics from the browser.
+// Its use must be enabled specifically via the
+// --enable-stats-collection-bindings command line flag.
+class StatsCollectionController : public webkit_glue::CppBoundClass {
+ public:
+  StatsCollectionController();
+
+  void set_message_sender(IPC::Sender* sender) {
+    sender_ = sender;
+  }
+
+  // Retrieves a histogram and returns a JSON representation of it.
+  void GetHistogram(const webkit_glue::CppArgumentList& args,
+                    webkit_glue::CppVariant* result);
+
+  // Retrieves a histogram from the browser process and returns a JSON
+  // representation of it.
+  void GetBrowserHistogram(const webkit_glue::CppArgumentList& args,
+                           webkit_glue::CppVariant* result);
+
+  // Returns JSON representation of tab timing information for the current tab.
+  void GetTabLoadTiming(const webkit_glue::CppArgumentList& args,
+                        webkit_glue::CppVariant* result);
+ private:
+  IPC::Sender* sender_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_