cc: Set the max frames pending from the thread proxy.

cc/frame_rate_controller.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_FRAME_RATE_CONTROLLER_H_
 #define CC_FRAME_RATE_CONTROLLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 11 matching lines @@
     virtual void vsyncTick(bool throttled) = 0;
 
 protected:
     virtual ~FrameRateControllerClient() {}
 };
 
 class FrameRateControllerTimeSourceAdapter;
 
 class CC_EXPORT FrameRateController {
 public:
+    enum {
+        kDefaultMaxFramesPending = 2
+    };
+
     explicit FrameRateController(scoped_refptr<TimeSource>);
     // Alternate form of FrameRateController with unthrottled frame-rate.
     explicit FrameRateController(Thread*);
     virtual ~FrameRateController();
 
     void setClient(FrameRateControllerClient* client) { m_client = client; }
 
     void setActive(bool);
 
     // Use the following methods to adjust target frame rate.
     //
     // Multiple frames can be in-progress, but for every didBeginFrame, a
     // didFinishFrame should be posted.
     //
     // If the rendering pipeline crashes, call didAbortAllPendingFrames.
     void didBeginFrame();
     void didFinishFrame();
     void didAbortAllPendingFrames();
     void setMaxFramesPending(int); // 0 for unlimited.
+    int maxFramesPending() const { return m_maxFramesPending; }
 
     // This returns null for unthrottled frame-rate.
     base::TimeTicks nextTickTime();
 
     void setTimebaseAndInterval(base::TimeTicks timebase, base::TimeDelta interval);
     void setSwapBuffersCompleteSupported(bool);
 
 protected:
     friend class FrameRateControllerTimeSourceAdapter;
     void onTimerTick();
@@ skipping 13 matching lines @@
     bool m_isTimeSourceThrottling;
     base::WeakPtrFactory<FrameRateController> m_weakFactory;
     Thread* m_thread;
 
     DISALLOW_COPY_AND_ASSIGN(FrameRateController);
 };
 
 }  // namespace cc
 
 #endif  // CC_FRAME_RATE_CONTROLLER_H_