Revert of Remove CompositorObserver::OnCompositingEnded()

content/browser/renderer_host/delegated_frame_host.cc

 // 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.
 
 #include "content/browser/renderer_host/delegated_frame_host.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 703 matching lines @@
     create_resize_lock_after_commit_ = false;
     MaybeCreateResizeLock();
   }
 }
 
 void DelegatedFrameHost::OnCompositingStarted(ui::Compositor* compositor,
                                               base::TimeTicks start_time) {
   last_draw_ended_ = start_time;
 }
 
+void DelegatedFrameHost::OnCompositingEnded(ui::Compositor* compositor) {}
+
 void DelegatedFrameHost::OnCompositingLockStateChanged(
     ui::Compositor* compositor) {
   if (resize_lock_ && resize_lock_->timed_out()) {
     // A compositor lock that is part of a resize lock timed out. We allow
     // the UI to produce a frame before locking it again, so we don't lock here.
     // We release the |resize_lock_| though to allow any other resizes that are
     // desired at the same time since we're allowing the UI to make a frame
     // which will gutter anyways.
     resize_lock_.reset();
     create_resize_lock_after_commit_ = true;
@@ skipping 130 matching lines @@
   }
 
   if (!skipped_frames_) {
     latest_confirmed_begin_frame_source_id_ = ack.source_id;
     latest_confirmed_begin_frame_sequence_number_ =
         ack.latest_confirmed_sequence_number;
   }
 }
 
 }  // namespace content