Fix software mirror mode on Ozone part 2/2

ui/gfx/display.h

Index: ui/gfx/display.h
diff --git a/ui/gfx/display.h b/ui/gfx/display.h
index 9054d7c7efef1d024f0dae00ce086591ee3684ad..90b659198fc96e99805eff0f8cee77ed8870b625 100644
--- a/ui/gfx/display.h
+++ b/ui/gfx/display.h
@@ -110,6 +110,13 @@ class GFX_EXPORT Display {
   // 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;
 
@@ -126,6 +133,7 @@ class GFX_EXPORT Display {
   float device_scale_factor_;
   Rotation rotation_;
   TouchSupport touch_support_;
+  int64 mirrored_display_id_;
 };
 
 }  // namespace gfx