Add a hang monitor for Pepper plugins

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index ab5fe3a83dac37cdc7029b3a7a0225ad82e66dce..450de9f7df4ce64f1da129aa980a01c0c7e6b8b2 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -576,6 +576,7 @@ bool WebContentsImpl::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_EndColorChooser, OnEndColorChooser)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetSelectedColorInColorChooser,
                         OnSetSelectedColorInColorChooser)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_PepperPluginHung, OnPepperPluginHung)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
 
@@ -1771,6 +1772,13 @@ void WebContentsImpl::OnSetSelectedColorInColorChooser(int color_chooser_id,
     color_chooser_->SetSelectedColor(color);
 }
 
+void TabContents::OnPepperPluginHung(int plugin_child_id,
+                                     const FilePath& path,
+                                     bool is_hung) {
+  if (delegate_)
+    delegate_->PluginHungStatusChanged(this, plugin_child_id, path, is_hung);
+}
+
 // Notifies the RenderWidgetHost instance about the fact that the page is
 // loading, or done loading and calls the base implementation.
 void WebContentsImpl::SetIsLoading(bool is_loading,