services/ui: Set the gpu_channel_ to new added displays.

services/ui/ws/window_server.h

 // 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.
 
 #ifndef SERVICES_UI_WS_WINDOW_SERVER_H_
 #define SERVICES_UI_WS_WINDOW_SERVER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 202 matching lines @@
                      ServerWindow* window,
                      WindowTree* initiator,
                      const gfx::Rect& revert_bounds);
   void EndMoveLoop();
   uint32_t GetCurrentMoveLoopChangeId();
   ServerWindow* GetCurrentMoveLoopWindow();
   WindowTree* GetCurrentMoveLoopInitiator();
   gfx::Rect GetCurrentMoveLoopRevertBounds();
   bool in_move_loop() const { return !!current_move_loop_; }
 
-  void OnFirstDisplayReady();
+  void OnDisplayReady(Display* display, bool is_first);
   void OnNoMoreDisplays();
   WindowManagerState* GetWindowManagerStateForUser(const UserId& user_id);
 
   // ServerWindowDelegate:
   ui::SurfacesState* GetSurfacesState() override;
 
   // UserDisplayManagerDelegate:
   bool GetFrameDecorationsForUser(
       const UserId& user_id,
       mojom::FrameDecorationValuesPtr* values) override;
@@ skipping 125 matching lines @@
   std::map<UserId, bool> high_contrast_mode_;
 
   // Maps from window manager change id to the client that initiated the
   // request.
   InFlightWindowManagerChangeMap in_flight_wm_change_map_;
 
   // Next id supplied to the window manager.
   uint32_t next_wm_change_id_;
 
   std::unique_ptr<GpuServiceProxy> gpu_proxy_;
+  scoped_refptr<gpu::GpuChannelHost> gpu_channel_;
   base::Callback<void(ServerWindow*)> window_paint_callback_;
 
   UserActivityMonitorMap activity_monitor_map_;
   UserClipboardMap clipboard_map_;
 
   WindowManagerWindowTreeFactorySet window_manager_window_tree_factory_set_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowServer);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_SERVER_H_