Mus: Introduce DisplayCompositorClient mojo interface

services/ui/surfaces/display_compositor.cc

 // Copyright 2015 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 "services/ui/surfaces/display_compositor.h"
 
 #include "services/ui/surfaces/display_compositor_client.h"
 
 namespace ui {
 
-DisplayCompositor::DisplayCompositor(DisplayCompositorClient* client)
-    : client_(client), next_client_id_(1u) {
+DisplayCompositor::DisplayCompositor(
+    cc::mojom::DisplayCompositorClientPtr client)
+    : client_(std::move(client)), next_client_id_(1u) {
   manager_.AddObserver(this);
 }
 
 uint32_t DisplayCompositor::GenerateNextClientId() {
   return next_client_id_++;
 }
 
 void DisplayCompositor::ReturnSurfaceReference(
     const cc::SurfaceSequence& sequence) {
   std::vector<uint32_t> sequences;
   sequences.push_back(sequence.sequence);
   manager_.DidSatisfySequences(sequence.frame_sink_id, &sequences);
 }
 
 DisplayCompositor::~DisplayCompositor() {
   manager_.RemoveObserver(this);
 }
 
 void DisplayCompositor::OnSurfaceCreated(const cc::SurfaceId& surface_id,
                                          const gfx::Size& frame_size,
                                          float device_scale_factor) {
   if (client_)
     client_->OnSurfaceCreated(surface_id, frame_size, device_scale_factor);
 }
 
 void DisplayCompositor::OnSurfaceDamaged(const cc::SurfaceId& surface_id,
                                          bool* changed) {}
 
 }  // namespace ui