Decouple BrowserCompositorOutputSurface from BeginFrameSource.

cc/scheduler/begin_frame_source.h

 // Copyright 2014 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_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 #define CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
 #include <string>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/scheduler/delay_based_time_source.h"
+#include "cc/scheduler/vsync_observer.h"
 
 namespace cc {
 
 // (Pure) Interface for observing BeginFrame messages from BeginFrameSource
 // objects.
 class CC_EXPORT BeginFrameObserver {
  public:
   virtual ~BeginFrameObserver() {}
 
   // The |args| given to OnBeginFrame is guaranteed to have
@@ skipping 93 matching lines @@
 class CC_EXPORT StubBeginFrameSource : public BeginFrameSource {
  public:
   void DidFinishFrame(BeginFrameObserver* obs,
                       size_t remaining_frames) override {}
   void AddObserver(BeginFrameObserver* obs) override {}
   void RemoveObserver(BeginFrameObserver* obs) override {}
   bool IsThrottled() const override;
 };
 
 // A frame source which ticks itself independently.
-class CC_EXPORT SyntheticBeginFrameSource : public BeginFrameSource {
+class CC_EXPORT SyntheticBeginFrameSource : public BeginFrameSource,
+                                            public VSyncObserver {
  public:
   ~SyntheticBeginFrameSource() override;
 
-  virtual void OnUpdateVSyncParameters(base::TimeTicks timebase,
-                                       base::TimeDelta interval) = 0;
   // This overrides any past or future interval from updating vsync parameters.
   virtual void SetAuthoritativeVSyncInterval(base::TimeDelta interval) = 0;
 };
 
 // A frame source which calls BeginFrame (at the next possible time) as soon as
 // remaining frames reaches zero.
 class CC_EXPORT BackToBackBeginFrameSource : public SyntheticBeginFrameSource,
                                              public DelayBasedTimeSourceClient {
  public:
   explicit BackToBackBeginFrameSource(
@@ skipping 92 matching lines @@
   ExternalBeginFrameSourceClient* client_;
   bool paused_ = false;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternalBeginFrameSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_