Add PlatformScreenDelegate and start implementation.

services/ui/display/platform_screen_impl_ozone.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_DISPLAY_PLATFORM_SCREEN_IMPL_OZONE_H_
 #define SERVICES_UI_DISPLAY_PLATFORM_SCREEN_IMPL_OZONE_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 10 matching lines @@
 // PlatformScreenImplOzone provides the necessary functionality to configure all
 // attached physical displays on the ozone platform.
 class PlatformScreenImplOzone : public PlatformScreen,
                                 public ui::DisplayConfigurator::Observer {
  public:
   PlatformScreenImplOzone();
   ~PlatformScreenImplOzone() override;
 
  private:
   // PlatformScreen:
-  void Init() override;  // Must not be called until after the ozone platform is
-                         // initialized.
-  void ConfigurePhysicalDisplay(
-      const ConfiguredDisplayCallback& callback) override;
+  void Init(PlatformScreenDelegate* delegate) override;
   int64_t GetPrimaryDisplayId() const override;
 
   // ui::DisplayConfigurator::Observer:
   void OnDisplayModeChanged(
       const ui::DisplayConfigurator::DisplayStateList& displays) override;
   void OnDisplayModeChangeFailed(
       const ui::DisplayConfigurator::DisplayStateList& displays,
       ui::MultipleDisplayState failed_new_state) override;
 
+  PlatformScreenDelegate* delegate_ = nullptr;
   ui::DisplayConfigurator display_configurator_;
 
   // TODO(kylechar): These values can/should be replaced by DisplayLayout.
   int64_t primary_display_id_ = display::Display::kInvalidDisplayID;
   std::set<uint64_t> displays_;
   gfx::Point next_display_origin_;
 
-  // Callback for when new displays are configured.
-  ConfiguredDisplayCallback callback_;
-
   DISALLOW_COPY_AND_ASSIGN(PlatformScreenImplOzone);
 };
 
 }  // namespace display
 
 #endif  // SERVICES_UI_DISPLAY_PLATFORM_SCREEN_IMPL_OZONE_H_