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

blimp/engine/renderer/frame_scheduler.h

Index: blimp/engine/renderer/frame_scheduler.h
diff --git a/blimp/engine/renderer/frame_scheduler.h b/blimp/engine/renderer/frame_scheduler.h
index bfe1a863c403f5fc5bfcf2b6ac4cd6ddd794f74c..3bf0f31f777176fce23f49f7b29d35ba35767bb6 100644
--- a/blimp/engine/renderer/frame_scheduler.h
+++ b/blimp/engine/renderer/frame_scheduler.h
@@ -52,11 +52,11 @@ class FrameScheduler {
   // 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();