Plugin Power Saver: Make PPS work well with prerendered pages.

components/plugins/renderer/loadable_plugin_placeholder.h

 // Copyright 2015 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 COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_
 #define COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "components/plugins/renderer/plugin_placeholder.h"
 #include "content/public/common/webplugininfo.h"
 #include "content/public/renderer/plugin_instance_throttler.h"
 
 namespace plugins {
 // Placeholders can be used if a plugin is missing or not available
 // (blocked or disabled).
 class LoadablePluginPlaceholder : public PluginPlaceholder {
  public:
   void set_blocked_for_background_tab(bool blocked_for_background_tab) {
     is_blocked_for_background_tab_ = blocked_for_background_tab;
   }
 
   void set_blocked_for_prerendering(bool blocked_for_prerendering) {
     is_blocked_for_prerendering_ = blocked_for_prerendering;
   }
 
 #if defined(ENABLE_PLUGINS)
+  bool power_saver_enabled() const { return power_saver_enabled_; }
+
   void set_power_saver_enabled(bool power_saver_enabled) {
     power_saver_enabled_ = power_saver_enabled;
   }
 
   // Defer loading of plugin, and instead show the Power Saver poster image.
   void BlockForPowerSaverPoster();
 
   // When we load the plugin, use this already-created plugin, not a new one.
   void SetPremadePlugin(content::PluginInstanceThrottler* throttler);
 #endif
@@ skipping 14 matching lines @@
       content::PluginInstanceThrottler::PowerSaverUnthrottleMethod method);
 #endif
 
   void OnLoadBlockedPlugins(const std::string& identifier);
   void OnSetIsPrerendering(bool is_prerendering);
 
   void SetMessage(const base::string16& message);
   void SetPluginInfo(const content::WebPluginInfo& plugin_info);
   const content::WebPluginInfo& GetPluginInfo() const;
   void SetIdentifier(const std::string& identifier);
+  const std::string& GetIdentifier() const;
   bool LoadingAllowed() const { return allow_loading_; }
 
   // Replace this placeholder with a different plugin (which could be
   // a placeholder again).
   void ReplacePlugin(blink::WebPlugin* new_plugin);
 
   // Hide this placeholder.
   void HidePlugin();
 
   // Load the blocked plugin.
@@ skipping 15 matching lines @@
 
   // Javascript callbacks:
   void LoadCallback();
   void HideCallback();
   void DidFinishLoadingCallback();
 
   void UpdateMessage();
 
   bool LoadingBlocked() const;
 
+  // Plugin creation is embedder-specific.
+  virtual blink::WebPlugin* CreatePlugin() = 0;
+
   content::WebPluginInfo plugin_info_;
 
   base::string16 message_;
 
   // True if the plugin load was deferred due to page being a background tab.
   // Plugin may be automatically loaded when the page is foregrounded.
   bool is_blocked_for_background_tab_;
 
   // True if the plugin was blocked because the page was being prerendered.
   // Plugin may be automatically be loaded when the page is displayed.
@@ skipping 16 matching lines @@
   std::string identifier_;
 
   base::WeakPtrFactory<LoadablePluginPlaceholder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LoadablePluginPlaceholder);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_