Fix software mirror mode on Ozone part 2/2

ui/gfx/display.h

 // Copyright (c) 2012 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_GFX_DISPLAY_H_
 #define UI_GFX_DISPLAY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 92 matching lines @@
 
   // Returns the display's size in pixel coordinates.
   gfx::Size GetSizeInPixel() const;
 
   // Returns a string representation of the display;
   std::string ToString() const;
 
   // True if the display contains valid display id.
   bool is_valid() const { return id_ != kInvalidDisplayID; }
 
+  // Sets the display which is mirrored on this display.
+  void set_mirrored_display_id(int64 id) { mirrored_display_id_ = id; }
+
+  // Returns the display which is mirrored on this display and kInvalidDisplayID
+  // otherwise.
+  int64 mirrored_display_id() const { return mirrored_display_id_; }

[oshima, 2015/03/04 00:54:36]

This is low level information that none of chrome code (chrome/content stuff)
needs, so I'd like to avoid having this in gfx::Display. Can we at least put
this somewhere in ui/display?

+
   // True if the display corresponds to internal panel.
   bool IsInternal() const;
 
   // Gets/Sets an id of display corresponding to internal panel.
   static int64 InternalDisplayId();
   static void SetInternalDisplayId(int64 internal_display_id);
 
   static const int64 kInvalidDisplayID;
 
  private:
   int64 id_;
   Rect bounds_;
   Rect work_area_;
   float device_scale_factor_;
   Rotation rotation_;
   TouchSupport touch_support_;
+  int64 mirrored_display_id_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_H_