Plugin Power Saver: Refactor Plugin Instance Throttling code

content/renderer/pepper/plugin_power_saver_helper.h

 // Copyright 2014 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_RENDERER_PEPPER_PLUGIN_POWER_SAVER_HELPER_H_
 #define CONTENT_RENDERER_PEPPER_PLUGIN_POWER_SAVER_HELPER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 15 matching lines @@
   // Power Saver is enabled for plugin content that are cross-origin and
   // heuristically determined to be not the "main attraction" of the webpage.
   //
   // Plugin content is defined to be cross-origin when the plugin source's
   // origin differs from the top level frame's origin. For example:
   //  - Cross-origin:  a.com -> b.com/plugin.swf
   //  - Cross-origin:  a.com -> b.com/iframe.html -> b.com/plugin.swf
   //  - Same-origin:   a.com -> b.com/iframe-to-a.html -> a.com/plugin.swf
   //
   // |cross_origin| may not be NULL.
-  bool ShouldThrottleContent(const GURL& content_origin,
-                             int width,
-                             int height,
-                             bool* cross_origin) const;
+  virtual bool ShouldThrottleContent(const GURL& content_origin,
+                                     int width,
+                                     int height,
+                                     bool* cross_origin) const;
 
   // Registers a plugin that has been marked peripheral. If the origin
   // whitelist is later updated and includes |content_origin|, then
   // |unthrottle_callback| will be called.
-  void RegisterPeripheralPlugin(const GURL& content_origin,
-                                const base::Closure& unthrottle_callback);
+  virtual void RegisterPeripheralPlugin(
+      const GURL& content_origin,
+      const base::Closure& unthrottle_callback);
 
-  void WhitelistContentOrigin(const GURL& content_origin);
+  virtual void WhitelistContentOrigin(const GURL& content_origin);
 
  private:
   struct PeripheralPlugin {
     PeripheralPlugin(const GURL& content_origin,
                      const base::Closure& unthrottle_callback);
     ~PeripheralPlugin();
 
     GURL content_origin;
     base::Closure unthrottle_callback;
   };
@@ skipping 10 matching lines @@
 
   // Set of peripheral plugins eligible to be unthrottled ex post facto.
   std::vector<PeripheralPlugin> peripheral_plugins_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginPowerSaverHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PLUGIN_POWER_SAVER_HELPER_H_