Unified BeginFrame scheduling

cc/trees/layer_tree_host_client.h

 // Copyright 2012 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 CC_TREES_LAYER_TREE_HOST_CLIENT_H_
 #define CC_TREES_LAYER_TREE_HOST_CLIENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace gfx {
 class Vector2d;
 }
 
 namespace cc {
 class ContextProvider;
 class InputHandlerClient;
 class OutputSurface;
+struct BeginFrameArgs;
 
 class LayerTreeHostClient {
  public:
   virtual void WillBeginMainFrame(int frame_id) = 0;
   // Marks finishing compositing-related tasks on the main thread. In threaded
   // mode, this corresponds to DidCommit().
   virtual void DidBeginMainFrame() = 0;
   virtual void Animate(base::TimeTicks frame_begin_time) = 0;
   virtual void Layout() = 0;
   virtual void ApplyScrollAndScale(const gfx::Vector2d& scroll_delta,
                                    float page_scale) = 0;
   // Creates an OutputSurface. If fallback is true, it should attempt to
   // create an OutputSurface that is guaranteed to initialize correctly.
   virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) = 0;
   virtual void DidInitializeOutputSurface() = 0;
   virtual void WillCommit() = 0;
   virtual void DidCommit() = 0;
   virtual void DidCommitAndDrawFrame() = 0;
   virtual void DidCompleteSwapBuffers() = 0;
 
   // Requests that the client insert a rate limiting token in the shared main
   // thread context's command stream that will block if the context gets too far
   // ahead of the compositor's command stream. Only needed if the tree contains
   // a TextureLayer that calls SetRateLimitContext(true).
   virtual void RateLimitSharedMainThreadContext() {}
 
+  // Change this to abstract method when all platforms are ready for unified
+  // BeginFrame.
+  virtual void SendBeginFrame(const BeginFrameArgs& args) {}

[brianderson, 2014/08/21 00:13:59]

Can you make the default implementation call NOT_REACHED() until it becomes pure
virtual?

[simonhong, 2014/08/26 08:24:48]

Removed.
Scheduler will call BeginFrameManager::SendBeginFrame directly.

+
   // This hook is for testing.
   virtual void DidFailToInitializeOutputSurface() {}
 
  protected:
   virtual ~LayerTreeHostClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_CLIENT_H_