PageLoadMetrics renderer and browser implementation.

components/page_load_metrics/common/page_load_metrics_messages.h

Index: components/page_load_metrics/common/page_load_metrics_messages.h
diff --git a/components/page_load_metrics/common/page_load_metrics_messages.h b/components/page_load_metrics/common/page_load_metrics_messages.h
new file mode 100644
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+++ b/components/page_load_metrics/common/page_load_metrics_messages.h
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+// Copyright 2015 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.
+
+// IPC messages for page load metrics.
+// Multiply-included message file, hence no include guard.
+
+#include "base/time/time.h"
+#include "components/page_load_metrics/common/page_load_timing.h"
+#include "ipc/ipc_message_macros.h"
+
+#define IPC_MESSAGE_START PageLoadMetricsMsgStart
+
+// See comments in page_load_timing.h for details on each field.
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::PageLoadTiming)
+  IPC_STRUCT_TRAITS_MEMBER(navigation_start)
+  IPC_STRUCT_TRAITS_MEMBER(response_start)
+  IPC_STRUCT_TRAITS_MEMBER(dom_content_loaded_event_start)
+  IPC_STRUCT_TRAITS_MEMBER(load_event_start)
+  IPC_STRUCT_TRAITS_MEMBER(first_layout)
+IPC_STRUCT_TRAITS_END()
+
+// Sent from renderer to browser process when the PageLoadTiming for the
+// associated frame changed.
+IPC_MESSAGE_ROUTED1(PageLoadMetricsMsg_TimingUpdated,
+                    page_load_metrics::PageLoadTiming)