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..09c8e3d05c9db1479c76f11eb1da7465d2592d98
--- /dev/null
+++ b/content/browser/stats_collection_message_filter.h
@@ -0,0 +1,44 @@
+// 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/common/tab_load_stats.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/notification_observer.h"
+
+namespace base {
+  class DictionaryValue;

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

No indent inside namespaces.

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

Done.

+}  // namespace base
+
+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;
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~StatsCollectionMessageFilter();
+
+  // Message handlers.
+  void OnGetTabLoadTimingInformation(int routing_id,
+                                     TabLoadTime* tab_timing_data,
+                                     base::TimeTicks* timer_start);
+
+  DISALLOW_COPY_AND_ASSIGN(StatsCollectionMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_STATS_COLLECTION_MESSAGE_FILTER_H_