Add FakeDisplayDelegate for off device usage.

ui/display/types/native_display_delegate.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_DISPLAY_TYPES_NATIVE_DISPLAY_DELEGATE_H_
 #define UI_DISPLAY_TYPES_NATIVE_DISPLAY_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/callback.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/display/types/display_types_export.h"
+#include "ui/display/types/virtual_display_controller.h"
 
 namespace gfx {
 class Point;
 class Size;
 }
 
 namespace ui {
 class DisplayMode;
 class DisplaySnapshot;
-
 class NativeDisplayObserver;
 
 struct GammaRampRGBEntry;
 
 typedef base::Callback<void(const std::vector<ui::DisplaySnapshot*>&)>
     GetDisplaysCallback;
 typedef base::Callback<void(bool)> ConfigureCallback;
 typedef base::Callback<void(bool, ui::HDCPState)> GetHDCPStateCallback;
 typedef base::Callback<void(bool)> SetHDCPStateCallback;
 typedef base::Callback<void(bool)> DisplayControlCallback;
@@ skipping 75 matching lines @@
   // Set the gamma tables and corection matrix for the display.
   virtual bool SetColorCorrection(
       const ui::DisplaySnapshot& output,
       const std::vector<GammaRampRGBEntry>& degamma_lut,
       const std::vector<GammaRampRGBEntry>& gamma_lut,
       const std::vector<float>& correction_matrix) = 0;
 
   virtual void AddObserver(NativeDisplayObserver* observer) = 0;
 
   virtual void RemoveObserver(NativeDisplayObserver* observer) = 0;
+
+  // Returns a virtual display controller that can modify the virtual display
+  // state. Will return null if not needed, most likely because this delegate
+  // doesn't use virtual displays.
+  virtual display::VirtualDisplayController* GetVirtualDisplayController() = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_TYPES_NATIVE_DISPLAY_DELEGATE_H_