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

content/renderer/stats_collection_extension.h

Index: content/renderer/stats_collection_extension.h
diff --git a/content/renderer/stats_collection_extension.h b/content/renderer/stats_collection_extension.h
new file mode 100644
index 0000000000000000000000000000000000000000..673cbd103cf4f805582db94488f231994eefffea
--- /dev/null
+++ b/content/renderer/stats_collection_extension.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2012 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_EXTENSION_H_
+#define CONTENT_RENDERER_STATS_COLLECTION_EXTENSION_H_
+
+#include "ipc/ipc_sender.h"
+#include "webkit/glue/cpp_bound_class.h"
+
+namespace content {
+
+// This class is exposed in JS as window.statsCollectionExtension and provides
+// functionality to read out statistics from the browser.
+// It's use must be enabled specifically via the

[Avi (use Gerrit), 2013/04/04 15:41:56]

s/It's/Its/

[jeremy, 2013/04/07 14:51:54]

Done.

+// --enable-stats-collection-bindings command line flag.
+class StatsCollectionExtension : public webkit_glue::CppBoundClass {
+ public:
+  StatsCollectionExtension();
+
+  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_EXTENSION_H_