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

content/browser/stats_collection_message_filter.h

Index: content/browser/stats_collection_message_filter.h
diff --git a/content/browser/stats_collection_message_filter.h b/content/browser/stats_collection_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..17e2b6b184e7a063fe6a7846c81d771f3bfca13f
--- /dev/null
+++ b/content/browser/stats_collection_message_filter.h
@@ -0,0 +1,39 @@
+// Copyright (c) 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_BROWSER_STATS_COLLECTION_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_STATS_COLLECTION_MESSAGE_FILTER_H_
+
+#include <string>
+
+#include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/notification_observer.h"
+
+namespace content {
+
+// This class sends and receives messages concerning stats collection in the
+// browser process.
+class StatsCollectionMessageFilter : public BrowserMessageFilter {
+ public:
+  StatsCollectionMessageFilter();
+
+  // BrowserMessageFilter implementation.
+  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
+
+  // BrowserMessageFilter implementation.

[bulach, 2013/03/11 19:11:37]

nit: I think you can remove 23-24 so it relies on the comment from 21

[jeremy, 2013/03/13 12:07:37]

Done.

+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~StatsCollectionMessageFilter();
+
+  // Message handlers.
+  void OnGetTabLoadTimingInformation(std::string* tab_timing_json);
+
+  DISALLOW_COPY_AND_ASSIGN(StatsCollectionMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_STATS_COLLECTION_MESSAGE_FILTER_H_