[cc] Pass on BeginFrameAcks from CompositorEBFS through RWHVAura, DFH.

content/browser/renderer_host/delegated_frame_host.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 CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 176 matching lines @@
   }
   bool ReleasedFrontLockActiveForTesting() const {
     return !!released_front_lock_.get();
   }
   void SetRequestCopyOfOutputCallbackForTesting(
       const base::Callback<void(std::unique_ptr<cc::CopyOutputRequest>)>&
           callback) {
     request_copy_of_output_callback_for_testing_ = callback;
   }
 
+  bool skipped_frames() const { return skipped_frames_; }
+
  private:
   friend class DelegatedFrameHostClient;
   friend class RenderWidgetHostViewAuraCopyRequestTest;
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            SkippedDelegatedFrames);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            DiscardDelegatedFramesWithLocking);
 
   RenderWidgetHostViewFrameSubscriber* frame_subscriber() const {
     return frame_subscriber_.get();
@@ skipping 131 matching lines @@
   std::unique_ptr<cc::ExternalBeginFrameSource> begin_frame_source_;
 
   bool needs_begin_frame_ = false;
 
   std::unique_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_