Adding UMA for sync IPCs

content/browser/renderer_host/render_process_host_impl.h

 // 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_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #pragma once
 
 #include <map>
 #include <queue>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/process.h"
 #include "base/synchronization/waitable_event_watcher.h"
 #include "base/timer.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_process_host.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ui/surface/transport_dib.h"
 
 class CommandLine;
 class GpuMessageFilter;
 class RendererMainThread;
 class RenderWidgetHelper;
 
 namespace base {
+class TimeDelta;
 class WaitableEvent;
 }
 
 namespace content {
 class RenderWidgetHost;
 class RenderWidgetHostImpl;
 }
 
 // Implements a concrete RenderProcessHost for the browser process for talking
 // to actual renderer processes (as opposed to mocks).
@@ skipping 113 matching lines @@
   friend class VisitRelayingRenderProcessHost;
 
   // Creates and adds the IO thread message filters.
   void CreateMessageFilters();
 
   // Control message handlers.
   void OnShutdownRequest();
   void OnDumpHandlesDone();
   void SuddenTerminationChanged(bool enabled);
   void OnUserMetricsRecordAction(const std::string& action);
+  void OnSyncIPCElapsedTime(const base::TimeDelta& delta);
   void OnSavedPageAsMHTML(int job_id, int64 mhtml_file_size);
 
   // CompositorSurfaceBuffersSwapped handler when there's no RWH.
   void OnCompositorSurfaceBuffersSwappedNoHost(int32 surface_id,
                                                uint64 surface_handle,
                                                int32 route_id,
                                                int32 gpu_process_host_id);
 
   // Generates a command line to be used to spawn a renderer and appends the
   // results to |*command_line|.
@@ skipping 88 matching lines @@
   // filtering for this at the render widget level.
   bool ignore_input_events_;
 
   // Records the last time we regarded the child process active.
   base::TimeTicks child_process_activity_time_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_