Revert of Remove CompositorObserver::OnCompositingEnded()

content/browser/renderer_host/browser_compositor_view_mac.mm

 // 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/browser_compositor_view_mac.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 68 matching lines @@
   void Suspend();
   void Unsuspend();
 
  private:
   RecyclableCompositorMac();
 
   // ui::CompositorObserver implementation:
   void OnCompositingDidCommit(ui::Compositor* compositor) override;
   void OnCompositingStarted(ui::Compositor* compositor,
                             base::TimeTicks start_time) override {}
+  void OnCompositingEnded(ui::Compositor* compositor) override {}
   void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
   void OnCompositingShuttingDown(ui::Compositor* compositor) override {}
 
   std::unique_ptr<ui::AcceleratedWidgetMac> accelerated_widget_mac_;
   ui::Compositor compositor_;
   std::unique_ptr<ui::CompositorLock> compositor_suspended_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(RecyclableCompositorMac);
 };
 
@@ skipping 339 matching lines @@
 void BrowserCompositorMac::OnBeginFrame(const cc::BeginFrameArgs& args) {
   client_->BrowserCompositorMacSendBeginFrame(args);
 }
 
 bool BrowserCompositorMac::IsAutoResizeEnabled() const {
   NOTREACHED();
   return false;
 }
 
 }  // namespace content