Add an histogram to differentiate between hang types of the renderer

content/browser/renderer_host/render_view_host_impl.cc

 // 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.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 557 matching lines @@
   prefs.user_gesture_required_for_presentation = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForPresentation);
 
   GetContentClient()->browser()->OverrideWebkitPrefs(this, &prefs);
   return prefs;
 }
 
 void RenderViewHostImpl::ClosePage() {
   is_waiting_for_close_ack_ = true;
   GetWidget()->StartHangMonitorTimeout(
-      TimeDelta::FromMilliseconds(kUnloadTimeoutMS));
+      TimeDelta::FromMilliseconds(kUnloadTimeoutMS),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_CLOSE_PAGE);
 
   if (IsRenderViewLive()) {
     // Since we are sending an IPC message to the renderer, increase the event
     // count to prevent the hang monitor timeout from being stopped by input
     // event acknowledgements.
     GetWidget()->increment_in_flight_event_count();
 
     // TODO(creis): Should this be moved to Shutdown?  It may not be called for
     // RenderViewHosts that have been swapped out.
     NotificationService::current()->Notify(
@@ skipping 742 matching lines @@
     // Note: We are using the origin URL provided by the sender here. It may be
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
   }
 }
 
 }  // namespace content