Plugin Power Saver: Add UI Overlay to throttled plugin using placeholder.

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 plug-in is missing or not available
 // (blocked or disabled).
-class LoadablePluginPlaceholder : public PluginPlaceholder {
+class LoadablePluginPlaceholder
+    : public PluginPlaceholder,
+      public content::PluginInstanceThrottler::Observer {
  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)
   void set_power_saver_mode(content::PluginPowerSaverMode power_saver_mode) {
     power_saver_mode_ = power_saver_mode;
   }
 
   // Defer loading of plug-in, and instead show the Power Saver poster image.
   void BlockForPowerSaverPoster();
 #endif
 
   void set_allow_loading(bool allow_loading) { allow_loading_ = allow_loading; }
 
+  // When we load the plugin, use this already-created plugin, not a new one.
+  void SetPremadePlugin(blink::WebPlugin* plugin,
+                        content::PluginInstanceThrottler* throttler);
+
  protected:
   LoadablePluginPlaceholder(content::RenderFrame* render_frame,
                             blink::WebLocalFrame* frame,
                             const blink::WebPluginParams& params,
                             const std::string& html_data,
                             GURL placeholderDataUrl);
 
   ~LoadablePluginPlaceholder() override;
 
 #if defined(ENABLE_PLUGINS)
@@ skipping 19 matching lines @@
 
   // Load the blocked plugin.
   void LoadPlugin();
 
   // gin::Wrappable method:
   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
  private:
   // WebViewPlugin::Delegate methods:
-  void ShowContextMenu(const blink::WebMouseEvent&) override;
+  void PluginDestroyed() override;
 
   // RenderFrameObserver methods:
   void WasShown() override;
 
+  // content::PluginInstanceThrottler::Observer methods:
+  void OnThrottleStateChange() override;
+
   // Javascript callbacks:
 
   // Load the blocked plugin by calling LoadPlugin().
   void LoadCallback();
 
   // Hide the blocked plugin by calling HidePlugin().
   void HideCallback();
 
   void DidFinishLoadingCallback();
 
@@ skipping 12 matching lines @@
   // True if the plugin was blocked because the page was being prerendered.
   // Plugin may be automatically be loaded when the page is displayed.
   bool is_blocked_for_prerendering_;
 
   // True if the plugin load was deferred due to a Power Saver poster.
   bool is_blocked_for_power_saver_poster_;
 
   // This is independent of deferred plugin load due to a Power Saver poster.
   content::PluginPowerSaverMode power_saver_mode_;
 
+  // When we load, uses this premade plugin instead of creating a new one.
+  blink::WebPlugin* premade_plugin_;
+  content::PluginInstanceThrottler* premade_throttler_;
+
   bool allow_loading_;
 
   // True if the placeholder was replaced with the real plugin.
   bool placeholder_was_replaced_;
 
   bool hidden_;
   bool finished_loading_;
   std::string identifier_;
 
   base::WeakPtrFactory<LoadablePluginPlaceholder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LoadablePluginPlaceholder);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_