Create a mirror window.

ash/display/display_manager.h

Index: ash/display/display_manager.h
diff --git a/ash/display/display_manager.h b/ash/display/display_manager.h
index 99441fc1c6d62a89cffd6588be644c85b01d3eb1..9dfc0aa2dd54a9c071ed033686fa145f9a1b2fd4 100644
--- a/ash/display/display_manager.h
+++ b/ash/display/display_manager.h
@@ -14,6 +14,7 @@
 #include "base/gtest_prod_util.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/aura/window.h"
+#include "ui/gfx/display.h"
 
 namespace gfx {
 class Display;
@@ -134,7 +135,7 @@ class ASH_EXPORT DisplayManager : public aura::RootWindowObserver {
 
   // Returns the mirroring status.
   bool IsMirrored() const;
-  int64 mirrored_display_id() const { return mirrored_display_id_; }
+  int64 mirrored_display_id() const { return mirrored_display_.id(); }
 
   // Returns the display object nearest given |window|.
   const gfx::Display& GetDisplayNearestPoint(
@@ -160,10 +161,6 @@ class ASH_EXPORT DisplayManager : public aura::RootWindowObserver {
   // desktop, this returns the first display ID.
   int64 GetDisplayIdForUIScaling() const;
 
-  // RootWindowObserver overrides:
-  virtual void OnRootWindowResized(const aura::RootWindow* root,
-                                   const gfx::Size& new_size) OVERRIDE;
-
   // Change the mirror mode.
   void SetMirrorMode(bool mirrored);
 
@@ -172,6 +169,13 @@ class ASH_EXPORT DisplayManager : public aura::RootWindowObserver {
   void AddRemoveDisplay();
   void ToggleDisplayScaleFactor();
 
+  // RootWindowObserver overrides:
+  virtual void OnRootWindowResized(const aura::RootWindow* root,
+                                   const gfx::Size& new_size) OVERRIDE;
+
+  // TODO(oshima): This will be SoftwareMirroringController override:
+  void SetSoftwareMirroring(bool enabled);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtendedDesktopTest, ConvertPoint);
   FRIEND_TEST_ALL_PREFIXES(DisplayManagerTest, TestNativeDisplaysChanged);
@@ -209,7 +213,7 @@ class ASH_EXPORT DisplayManager : public aura::RootWindowObserver {
 
   int64 first_display_id_;
 
-  int64 mirrored_display_id_;
+  gfx::Display mirrored_display_;
 
   // List of current active dispays.
   DisplayList displays_;
@@ -228,6 +232,8 @@ class ASH_EXPORT DisplayManager : public aura::RootWindowObserver {
   // on device as well as during the unit tests.
   bool change_display_upon_host_resize_;
 
+  bool software_mirroring_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };