Add a hang monitor for Pepper plugins

content/public/browser/plugin_service.h

Index: content/public/browser/plugin_service.h
diff --git a/content/public/browser/plugin_service.h b/content/public/browser/plugin_service.h
index 5be3d087cada0d7ef04722450f2b0fdb7b8fbc0c..862aca4a125c1f81e5a9f21ed0b55937582519fc 100644
--- a/content/public/browser/plugin_service.h
+++ b/content/public/browser/plugin_service.h
@@ -93,6 +93,11 @@ class PluginService {
   virtual bool GetPluginInfoByPath(const FilePath& plugin_path,
                                    webkit::WebPluginInfo* info) = 0;
 
+  // Returns the display name for the plugin identified by the given path. If
+  // the path doesn't identify a plugin, or the plugin has no display name,
+  // this will attempt to generate a display name from the path.
+  virtual string16 GetPluginDisplayNameByPath(const FilePath& plugin_path) = 0;
+
   // Asynchronously loads plugins if necessary and then calls back to the
   // provided function on the calling MessageLoop on completion.
   virtual void GetPlugins(const GetPluginsCallback& callback) = 0;