Remove MojoCompositorFrameSink::WillDrawSurface

components/exo/compositor_frame_sink.h

 // Copyright 2016 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 COMPONENTS_EXO_EXO_COMPOSITOR_FRAME_SINK_H_
 #define COMPONENTS_EXO_EXO_COMPOSITOR_FRAME_SINK_H_
 
 #include "cc/ipc/compositor_frame.mojom.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/resources/transferable_resource.h"
@@ skipping 19 matching lines @@
   void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
                              cc::CompositorFrame frame) override;
   void BeginFrameDidNotSwap(const cc::BeginFrameAck& begin_frame_ack) override;
   void EvictFrame() override;
 
   // Overridden from cc::CompositorFrameSinkSupportClient:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
-                       const gfx::Rect& damage_rect) override;
+                       const gfx::Rect& damage_rect) override {}
 
  private:
   cc::CompositorFrameSinkSupport support_;
   CompositorFrameSinkHolder* const client_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorFrameSink);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_EXO_COMPOSITOR_FRAME_SINK_H_