Allow browser compositor control over frames pending with surfaceless rendering on freon.

cc/trees/single_thread_proxy.h

 // Copyright 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 CC_TREES_SINGLE_THREAD_PROXY_H_
 #define CC_TREES_SINGLE_THREAD_PROXY_H_
 
 #include <limits>
 
 #include "base/cancelable_callback.h"
@@ skipping 69 matching lines @@
   void DidBeginImplFrameDeadline() override;
   void SendBeginFramesToChildren(const BeginFrameArgs& args) override;
   void SendBeginMainFrameNotExpectedSoon() override;
 
   // LayerTreeHostImplClient implementation
   void UpdateRendererCapabilitiesOnImplThread() override;
   void DidLoseOutputSurfaceOnImplThread() override;
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval) override;
   void SetEstimatedParentDrawTime(base::TimeDelta draw_time) override;
-  void SetMaxSwapsPendingOnImplThread(int max) override {}
+  void SetMaxSwapsPendingOnImplThread(int max) override;
   void DidSwapBuffersOnImplThread() override;
   void DidSwapBuffersCompleteOnImplThread() override;
   void OnCanDrawStateChanged(bool can_draw) override;
   void NotifyReadyToActivate() override;
   void NotifyReadyToDraw() override;
   void SetNeedsRedrawOnImplThread() override;
   void SetNeedsRedrawRectOnImplThread(const gfx::Rect& dirty_rect) override;
   void SetNeedsAnimateOnImplThread() override;
   void SetNeedsPrepareTilesOnImplThread() override;
   void SetNeedsCommitOnImplThread() override;
@@ skipping 130 matching lines @@
  private:
   DebugScopedSetImplThread impl_thread_;
   DebugScopedSetMainThreadBlocked main_thread_blocked_;
 
   DISALLOW_COPY_AND_ASSIGN(DebugScopedSetImplThreadAndMainThreadBlocked);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_SINGLE_THREAD_PROXY_H_