aw: Improve idle task scheduling

android_webview/browser/shared_renderer_state.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_SHARED_RENDERER_STATE_H_
 #define ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
+#include "base/cancelable_callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/lock.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 
 namespace cc {
 class CompositorFrameAck;
 }
 
 namespace gpu {
 class GLInProcessContext;
 }
 
 namespace android_webview {
 
+namespace internal {
+class RequestDrawGLTracker;
+}
+
 class BrowserViewRendererClient;
 class InsideHardwareReleaseReset;
 
 // Set by BrowserViewRenderer and read by HardwareRenderer.
 struct DrawGLInput {
   gfx::Vector2d scroll_offset;
   int width;
   int height;
   cc::CompositorFrame frame;
 
   DrawGLInput();
   ~DrawGLInput();
 };
 
 // This class is used to pass data between UI thread and RenderThread.
 class SharedRendererState {
  public:
   SharedRendererState(scoped_refptr<base::MessageLoopProxy> ui_loop,
                       BrowserViewRendererClient* client);
   ~SharedRendererState();
 
-  bool CurrentlyOnUIThread();
   void ClientRequestDrawGL();
+  void DidDrawGLProcess();
 
   void SetDrawGLInput(scoped_ptr<DrawGLInput> input);
   scoped_ptr<DrawGLInput> PassDrawGLInput();
 
   bool IsInsideHardwareRelease() const;
   void PostExternalDrawConstraintsToChildCompositor(
       const ParentCompositorDrawConstraints& parent_draw_constraints);
 
   const ParentCompositorDrawConstraints ParentDrawConstraints() const;
 
   void SetSharedContext(gpu::GLInProcessContext* context);
   gpu::GLInProcessContext* GetSharedContext() const;
 
   void InsertReturnedResources(const cc::ReturnedResourceArray& resources);
   void SwapReturnedResources(cc::ReturnedResourceArray* resources);
   bool ReturnedResourcesEmpty() const;
 
  private:
   friend class InsideHardwareReleaseReset;
+  friend class internal::RequestDrawGLTracker;
 
+  void ResetRequestDrawGLCallback();
   void ClientRequestDrawGLOnUIThread();
   void UpdateParentDrawConstraintsOnUIThread();
   void SetInsideHardwareRelease(bool inside);
 
   scoped_refptr<base::MessageLoopProxy> ui_loop_;
   BrowserViewRendererClient* client_on_ui_;
   base::WeakPtrFactory<SharedRendererState> weak_factory_on_ui_thread_;
   base::WeakPtr<SharedRendererState> ui_thread_weak_ptr_;
+  base::CancelableClosure request_draw_gl_cancelable_closure_;
 
   // Accessed by both UI and RT thread.
   mutable base::Lock lock_;
   scoped_ptr<DrawGLInput> draw_gl_input_;
   bool inside_hardware_release_;
   ParentCompositorDrawConstraints parent_draw_constraints_;
   gpu::GLInProcessContext* share_context_;
   cc::ReturnedResourceArray returned_resources_;
+  base::Closure request_draw_gl_closure_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedRendererState);
 };
 
 class InsideHardwareReleaseReset {
  public:
   explicit InsideHardwareReleaseReset(
       SharedRendererState* shared_renderer_state);
   ~InsideHardwareReleaseReset();
 
  private:
   SharedRendererState* shared_renderer_state_;
 
   DISALLOW_COPY_AND_ASSIGN(InsideHardwareReleaseReset);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_