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

components/plugins/renderer/loadable_plugin_placeholder.h

Index: components/plugins/renderer/loadable_plugin_placeholder.h
diff --git a/components/plugins/renderer/loadable_plugin_placeholder.h b/components/plugins/renderer/loadable_plugin_placeholder.h
index 53ef5e11e484aecb0305ab6f398a6ae09d10f9d8..b2a3f2e4357fa90d74c84cac0cff2fff2897e193 100644
--- a/components/plugins/renderer/loadable_plugin_placeholder.h
+++ b/components/plugins/renderer/loadable_plugin_placeholder.h
@@ -24,6 +24,8 @@ class LoadablePluginPlaceholder : public PluginPlaceholder {
   }
 
 #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;
   }
@@ -58,6 +60,7 @@ class LoadablePluginPlaceholder : public PluginPlaceholder {
   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
@@ -95,6 +98,9 @@ class LoadablePluginPlaceholder : public PluginPlaceholder {
 
   bool LoadingBlocked() const;
 
+  // Plugin creation is embedder-specific.
+  virtual blink::WebPlugin* CreatePlugin() = 0;
+
   content::WebPluginInfo plugin_info_;
 
   base::string16 message_;
@@ -107,6 +113,7 @@ class LoadablePluginPlaceholder : public PluginPlaceholder {
   // Plugin may be automatically be loaded when the page is displayed.
   bool is_blocked_for_prerendering_;
 
+#if defined(ENABLE_PLUGINS)
   // True if the plugin load was deferred due to a Power Saver poster.
   bool is_blocked_for_power_saver_poster_;
 
@@ -116,6 +123,7 @@ class LoadablePluginPlaceholder : public PluginPlaceholder {
 
   // When we load, uses this premade plugin instead of creating a new one.
   content::PluginInstanceThrottler* premade_throttler_;
+#endif
 
   bool allow_loading_;