Add a hang monitor for Pepper plugins

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 91f37aeb4b48f70cf6959402a2dab79dc91330a0..5c54ebecaffc067107e0520133cc55afb2a0efa7 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -132,9 +132,10 @@ class OpenChannelToPpapiPluginCallback
   }
 
   virtual void OnChannelOpened(base::ProcessHandle plugin_process_handle,
-                               const IPC::ChannelHandle& channel_handle) {
+                               const IPC::ChannelHandle& channel_handle,
+                               int plugin_child_id) {
     ViewHostMsg_OpenChannelToPepperPlugin::WriteReplyParams(
-        reply_msg(), plugin_process_handle, channel_handle);
+        reply_msg(), plugin_process_handle, channel_handle, plugin_child_id);
     SendReplyAndDeleteThis();
   }
 
@@ -166,7 +167,8 @@ class OpenChannelToPpapiBrokerCallback
   }
 
   virtual void OnChannelOpened(base::ProcessHandle broker_process_handle,
-                               const IPC::ChannelHandle& channel_handle) {
+                               const IPC::ChannelHandle& channel_handle,
+                               int /* plugin_child_id */) {
     filter_->Send(new ViewMsg_PpapiBrokerChannelCreated(routing_id_,
                                                         request_id_,
                                                         broker_process_handle,