aw: Improve idle task scheduling

android_webview/browser/deferred_gpu_command_service.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 ANDROID_WEBVIEW_BROWSER_DEFERRED_GPU_COMMAND_SERVICE_H_
 #define ANDROID_WEBVIEW_BROWSER_DEFERRED_GPU_COMMAND_SERVICE_H_
 
 #include <queue>
 #include <utility>
 
@@ skipping 27 matching lines @@
 
   virtual void ScheduleTask(const base::Closure& task) OVERRIDE;
   virtual void ScheduleIdleWork(const base::Closure& task) OVERRIDE;
   virtual bool UseVirtualizedGLContexts() OVERRIDE;
   virtual scoped_refptr<gpu::gles2::ShaderTranslatorCache>
       shader_translator_cache() OVERRIDE;
 
   void RunTasks();
   // If |is_idle| is false, this will only run older idle tasks.
   void PerformIdleWork(bool is_idle);
-  bool HasIdleWork();
+  // Flush the idle queue until it is empty. This is different from
+  // PerformIdleWork(is_idle = true), which does not run any newly scheduled
+  // idle tasks during the idle run.
+  void PerformAllIdleWork();
 
   virtual void AddRef() const OVERRIDE;
   virtual void Release() const OVERRIDE;
 
  protected:
   virtual ~DeferredGpuCommandService();
   friend class base::RefCountedThreadSafe<DeferredGpuCommandService>;
 
  private:
   friend class ScopedAllowGL;
   static void RequestProcessGL();
 
   DeferredGpuCommandService();
+  size_t IdleQueueSize();
 
   base::Lock tasks_lock_;
   std::queue<base::Closure> tasks_;
   std::queue<std::pair<base::Time, base::Closure> > idle_tasks_;
 
   scoped_refptr<gpu::gles2::ShaderTranslatorCache> shader_translator_cache_;
   DISALLOW_COPY_AND_ASSIGN(DeferredGpuCommandService);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_DEFERRED_GPU_COMMAND_SERVICE_H_