cc: Add support for handling authoritative vsync interval

cc/trees/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_PROXY_H_
 #define CC_TREES_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 88 matching lines @@
 
   // Maximum number of sub-region texture updates supported for each commit.
   virtual size_t MaxPartialTextureUpdates() const = 0;
 
   virtual bool SupportsImplScrolling() const = 0;
 
   virtual void SetDebugState(const LayerTreeDebugState& debug_state) = 0;
 
   virtual void SetChildrenNeedBeginFrames(bool children_need_begin_frames) = 0;
 
+  virtual void SetAuthoritativeVSyncInterval(
+      const base::TimeDelta& interval) = 0;
+
   // Testing hooks
   virtual bool MainFrameWillHappenForTesting() = 0;
 
   BlockingTaskRunner* blocking_main_thread_task_runner() const {
     return blocking_main_thread_task_runner_.get();
   }
 
  protected:
   Proxy(scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
         scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
@@ skipping 36 matching lines @@
   explicit DebugScopedSetMainThreadBlocked(Proxy* proxy) {}
   ~DebugScopedSetMainThreadBlocked() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(DebugScopedSetMainThreadBlocked);
 };
 #endif
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_