Add UMA counter for hung renderers on cross-site navigation.

content/browser/renderer_host/resource_dispatcher_host_impl.h

Index: content/browser/renderer_host/resource_dispatcher_host_impl.h
diff --git a/content/browser/renderer_host/resource_dispatcher_host_impl.h b/content/browser/renderer_host/resource_dispatcher_host_impl.h
index 8b82c1043b8a6a3a1160ff71ed9cd835eb1101d3..16ed9667a940fcc5fef1974189a8c1990b53742a 100644
--- a/content/browser/renderer_host/resource_dispatcher_host_impl.h
+++ b/content/browser/renderer_host/resource_dispatcher_host_impl.h
@@ -155,6 +155,11 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // Called when the unload handler for a cross-site request has finished.
   void OnSwapOutACK(const ViewMsg_SwapOut_Params& params);
 
+  // Called when we want to simulate the renderer process sending
+  // ViewHostMsg_SwapOut_ACK in cases where the renderer has died or is
+  // unresponsive.
+  void OnSimulateSwapOutACK(const ViewMsg_SwapOut_Params& params);
+
   // Called when the renderer loads a resource from its internal cache.
   void OnDidLoadResourceFromMemoryCache(const GURL& url,
                                         const std::string& security_info,
@@ -250,6 +255,10 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // A shutdown helper that runs on the IO thread.
   void OnShutdown();
 
+  // The real implementation of the OnSwapOutACK logic. Public methods call
+  // this method with the proper value for the timed_out parameter.
+  void HandleSwapOutACK(const ViewMsg_SwapOut_Params& params, bool timed_out);
+
   // Helper function for regular and download requests.
   void BeginRequestInternal(scoped_ptr<net::URLRequest> request,
                             scoped_ptr<ResourceHandler> handler);