Add PlatformScreenDelegate and start implementation.

services/ui/ws/user_display_manager.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_USER_DISPLAY_MANAGER_H_
 #define SERVICES_UI_WS_USER_DISPLAY_MANAGER_H_
 
 #include <set>
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/interface_ptr_set.h"
 #include "services/ui/public/interfaces/display.mojom.h"
 #include "services/ui/ws/user_id.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ui {
 namespace ws {
 
 class Display;
 class DisplayManager;
-class DisplayManagerDelegate;
+class UserDisplayManagerDelegate;
 
 namespace test {
 class UserDisplayManagerTestApi;
 }
 
 // Provides per user display state.
 class UserDisplayManager : public mojom::DisplayManager {
  public:
   UserDisplayManager(ws::DisplayManager* display_manager,
-                     DisplayManagerDelegate* delegate,
+                     UserDisplayManagerDelegate* delegate,
                      const UserId& user_id);
   ~UserDisplayManager() override;
 
   // Called when the frame decorations for this user change.
   void OnFrameDecorationValuesChanged();
 
   void AddDisplayManagerBinding(
       mojo::InterfaceRequest<mojom::DisplayManager> request);
 
   // Called by Display prior to |display| being removed and destroyed.
@@ skipping 25 matching lines @@
   // Overriden from mojom::DisplayManager:
   void AddObserver(mojom::DisplayManagerObserverPtr observer) override;
 
   base::subtle::Atomic32* cursor_location_memory() {
     return reinterpret_cast<base::subtle::Atomic32*>(
         cursor_location_mapping_.get());
   }
 
   ws::DisplayManager* display_manager_;
 
-  DisplayManagerDelegate* delegate_;
+  UserDisplayManagerDelegate* delegate_;
 
   const UserId user_id_;
 
   // Set to true the first time at least one Display has valid frame values.
   bool got_valid_frame_decorations_;
 
   mojo::BindingSet<mojom::DisplayManager> display_manager_bindings_;
 
   // WARNING: only use these once |got_valid_frame_decorations_| is true.
   mojo::InterfacePtrSet<mojom::DisplayManagerObserver>
@@ skipping 16 matching lines @@
   // mojo connection, this data must be read atomically.)
   mojo::ScopedSharedBufferMapping cursor_location_mapping_;
 
   DISALLOW_COPY_AND_ASSIGN(UserDisplayManager);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_USER_DISPLAY_MANAGER_H_