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();
 
- protected:
-  // protected for testing.
-  FrameScheduler(base::TimeDelta frame_delay,
-                 scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-                 FrameSchedulerClient* client);
+  bool needs_frame_update() const { return needs_frame_update_; }
+
+  void set_frame_delay_for_testing(base::TimeDelta frame_delay) {
+    frame_delay_ = frame_delay;
+  }
 
  private:
   void ScheduleFrameUpdateIfNecessary();
 
   // Returns true if a frame update can be started. The Scheduler can not
   // produce new frames either if there is no request for frames pending or we
   // are waiting for an ack for a frame previously sent to the client.
   bool ShouldProduceFrameUpdates() const;
 
   void StartFrameUpdate();
@@ skipping 17 matching lines @@
 
   FrameSchedulerClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameScheduler);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_