[mus]Add FrameGenerator::SetHighContrastMode(bool)

services/ui/ws/frame_generator.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 SERVICES_UI_WS_FRAME_GENERATOR_H_
 #define SERVICES_UI_WS_FRAME_GENERATOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 19 matching lines @@
 
 class FrameGeneratorDelegate;
 class ServerWindow;
 
 // Responsible for redrawing the display in response to the redraw requests by
 // submitting CompositorFrames to the owned CompositorFrameSink.
 class FrameGenerator : public cc::CompositorFrameSinkClient,
                        public cc::BeginFrameObserver {
  public:
   FrameGenerator(
-      FrameGeneratorDelegate* delegate,
       ServerWindow* root_window,
       std::unique_ptr<cc::CompositorFrameSink> compositor_frame_sink);
   ~FrameGenerator() override;
 
   void SetDeviceScaleFactor(float device_scale_factor);
+  void SetHighContrastMode(bool enabled);
 
   // Updates the WindowManager's SurfaceInfo.
   void OnSurfaceCreated(const cc::SurfaceInfo& surface_info);
 
   void OnWindowDamaged();
 
  private:
   // cc::CompositorFrameSinkClient implementation:
   void SetBeginFrameSource(cc::BeginFrameSource* source) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
@@ skipping 25 matching lines @@
   void SetNeedsBeginFrame(bool needs_begin_frame);
 
   FrameGeneratorDelegate* delegate_;
   ServerWindow* const root_window_;
   float device_scale_factor_ = 1.f;
 
   std::unique_ptr<cc::CompositorFrameSink> compositor_frame_sink_;
   cc::BeginFrameArgs last_begin_frame_args_;
   cc::BeginFrameSource* begin_frame_source_ = nullptr;
   bool observing_begin_frames_ = false;
+  bool high_contrast_mode_enabled_ = false;
 
   cc::SurfaceInfo window_manager_surface_info_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameGenerator);
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_FRAME_GENERATOR_H_