Add FakeDisplayDelegate for off device usage.

ui/ozone/common/native_display_delegate_ozone.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 UI_OZONE_COMMON_NATIVE_DISPLAY_DELEGATE_OZONE_H_
 #define UI_OZONE_COMMON_NATIVE_DISPLAY_DELEGATE_OZONE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 37 matching lines @@
       const ui::DisplaySnapshot& output) override;
   bool SetColorCalibrationProfile(
       const ui::DisplaySnapshot& output,
       ui::ColorCalibrationProfile new_profile) override;
   bool SetColorCorrection(const ui::DisplaySnapshot& output,
                           const std::vector<GammaRampRGBEntry>& degamma_lut,
                           const std::vector<GammaRampRGBEntry>& gamma_lut,
                           const std::vector<float>& correction_matrix) override;
   void AddObserver(NativeDisplayObserver* observer) override;
   void RemoveObserver(NativeDisplayObserver* observer) override;
-
- protected:
-  std::vector<std::unique_ptr<DisplaySnapshot>>& displays() {
-    return displays_;
-  }
+  display::FakeDisplayController* GetFakeDisplayController() override;
 
  private:
   std::vector<std::unique_ptr<DisplaySnapshot>> displays_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeDisplayDelegateOzone);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_COMMON_NATIVE_DISPLAY_DELEGATE_OZONE_H_