Fixing a problem, where a hung renderer process is not killed when navigating away

content/browser/renderer_host/render_widget_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_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 184 matching lines @@
   // trigger a re-composite to the view. If a resize is pending, it will
   // block briefly waiting for an ack from the renderer.
   void ScheduleComposite();
 
   // Starts a hang monitor timeout. If there's already a hang monitor timeout
   // the new one will only fire if it has a shorter delay than the time
   // left on the existing timeouts.
   void StartHangMonitorTimeout(base::TimeDelta delay);
 
   // Stops all existing hang monitor timeouts and assumes the renderer is
-  // responsive.
-  void StopHangMonitorTimeout();
+  // responsive. It is virtual so RenderViewHost can make a decision whether
+  // the timer should be stopped, to avoid stopping it during cross site
+  // navigation.
+  virtual void StopHangMonitorTimeout();
 
   // Forwards the given message to the renderer. These are called by the view
   // when it has received a message.
   void ForwardGestureEvent(const WebKit::WebGestureEvent& gesture_event);
   virtual void ForwardTouchEvent(const WebKit::WebTouchEvent& touch_event);
 
 #if defined(TOOLKIT_USES_GTK)
   // Give key press listeners a chance to handle this key press. This allow
   // widgets that don't have focus to still handle key presses.
   bool KeyPressListenersHandleEvent(GdkEventKey* event);
@@ skipping 473 matching lines @@
   bool has_touch_handler_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_