cc/blimp: Add synchronization for scroll/scale state.

blimp/engine/renderer/frame_scheduler.h

 // Copyright 2016 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 BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_
 #define BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
@@ skipping 34 matching lines @@
 
   // Called when a frame update is sent to the client. This must be called only
   // when the |client| is producing a frame update in
   // FrameSchedulerClient::StartFrameUpdate and must be followed with a
   // DidReceiveFrameUpdateAck when the frame sent is ack-ed by the client.
   void DidSendFrameUpdateToClient();
 
   // Called when an Ack is received for a frame sent to the client.
   void DidReceiveFrameUpdateAck();
 
+  bool needs_frame_update() const { return needs_frame_update_; }
+
  protected:
   // protected for testing.
   FrameScheduler(base::TimeDelta frame_delay,
                  scoped_refptr<base::SingleThreadTaskRunner> task_runner,
                  FrameSchedulerClient* client);
 
  private:
   void ScheduleFrameUpdateIfNecessary();
 
   // Returns true if a frame update can be started. The Scheduler can not
@@ skipping 22 matching lines @@
 
   FrameSchedulerClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameScheduler);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_