Schedule idle handler based on CPU usage.

chrome/renderer/extensions/extension_dispatcher.h

 // Copyright (c) 2011 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 CHROME_RENDERER_EXTENSIONS_EXTENSION_DISPATCHER_H_
 #define CHROME_RENDERER_EXTENSIONS_EXTENSION_DISPATCHER_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 72 matching lines @@
   // If the extension is in fact idle, tell the browser process to close
   // the background page.
   void CheckIdleStatus(const std::string& extension_id);
 
  private:
   friend class RenderViewTest;
 
   // RenderProcessObserver implementation:
   virtual bool OnControlMessageReceived(const IPC::Message& message);
   virtual void WebKitInitialized();
-  virtual void IdleNotification();
 
   void OnMessageInvoke(const std::string& extension_id,
                        const std::string& function_name,
                        const base::ListValue& args,
                        const GURL& event_url);
   void OnDeliverMessage(int target_port_id, const std::string& message);
   void OnSetFunctionNames(const std::vector<std::string>& names);
   void OnLoaded(const ExtensionMsg_Loaded_Params& params);
   void OnUnloaded(const std::string& id);
   void OnSetScriptingWhitelist(
@@ skipping 33 matching lines @@
   // counterpart to ExtensionService in the browser. It contains information
   // about all extensions currently loaded by the browser.
   ExtensionSet extensions_;
 
   // All the bindings contexts that are currently loaded for this renderer.
   // There is zero or one for each v8 context.
   ChromeV8ContextSet v8_context_set_;
 
   scoped_ptr<UserScriptSlave> user_script_slave_;
 
-  // Same as above, but on a longer timer and will run even if the process is
-  // not idle, to ensure that IdleHandle gets called eventually.
-  base::RepeatingTimer<content::RenderThread> forced_idle_timer_;
-
   // The v8 extensions which are restricted to extension-related contexts.
   std::set<std::string> restricted_v8_extensions_;
 
   // All declared function names from extension_api.json.
   std::set<std::string> function_names_;
 
   // The extensions that are active in this process.
   std::set<std::string> active_extension_ids_;
 
   // The applications that are active in this process.
   std::set<std::string> active_application_ids_;
 
   // True once WebKit has been initialized (and it is therefore safe to poke).
   bool is_webkit_initialized_;
 
   std::string test_extension_id_;
 
   // Status of webrequest usage for known extensions.
   // TODO(mpcomplete): remove. http://crbug.com/100411
   bool webrequest_adblock_;
   bool webrequest_adblock_plus_;
   bool webrequest_other_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDispatcher);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_DISPATCHER_H_