Don't schedule more invokeFunctors than necessary.

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/gl_view_renderer_manager.h"
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "base/cancelable_callback.h"
@@ skipping 77 matching lines @@
   void UpdateParentDrawConstraintsOnUI();
   void DidSkipCommitFrameOnUI();
   bool IsInsideHardwareRelease() const;
   void SetInsideHardwareRelease(bool inside);
 
   // Accessed by UI thread.
   scoped_refptr<base::SingleThreadTaskRunner> ui_loop_;
   BrowserViewRenderer* browser_view_renderer_;
   base::WeakPtr<SharedRendererState> ui_thread_weak_ptr_;
   base::CancelableClosure request_draw_gl_cancelable_closure_;
+  // This is true after BrowserViewRender::RequestDrawGL is called, and before
+  // the next GL mode process. False in other times.
+  bool has_queued_functor_on_ui_;

[boliu, 2014/12/13 01:03:15]

This state should be tracked in RequestDrawGLTracker

[hush (inactive), 2014/12/13 01:17:23]

Right. Good point!

 
   // Accessed by RT thread.
   scoped_ptr<HardwareRenderer> hardware_renderer_;
 
   // This is accessed by both UI and RT now. TODO(hush): move to RT only.
   GLViewRendererManager::Key renderer_manager_key_;
 
   // Accessed by both UI and RT thread.
   mutable base::Lock lock_;
   gfx::Vector2d scroll_offset_;
   scoped_ptr<cc::CompositorFrame> compositor_frame_;
   bool force_commit_;
   bool inside_hardware_release_;
   bool needs_force_invalidate_on_next_draw_gl_;
   ParentCompositorDrawConstraints parent_draw_constraints_;
   cc::ReturnedResourceArray returned_resources_;
   base::Closure request_draw_gl_closure_;
 
   base::WeakPtrFactory<SharedRendererState> weak_factory_on_ui_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedRendererState);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_