Try to enable software mirror mode in UI message loop after Init()

ash/display/display_manager.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 ASH_DISPLAY_DISPLAY_MANAGER_H_
 #define ASH_DISPLAY_DISPLAY_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 199 matching lines @@
   // of on a device.
   void AddRemoveDisplay();
   void ToggleDisplayScaleFactor();
 
   // SoftwareMirroringController override:
 #if defined(OS_CHROMEOS)
   virtual void SetSoftwareMirroring(bool enabled) OVERRIDE;
 #else
   void SetSoftwareMirroring(bool enabled);
 #endif
+  bool software_mirroring_enabled() const {
+    return software_mirroring_enabled_;
+  };
 
   // Update the bounds of the display given by |display_id|.
   bool UpdateDisplayBounds(int64 display_id,
                            const gfx::Rect& new_bounds);
+
+  // Creates mirror window if the software mirror mode is enabled.
+  // This is used only for bootstrap.
+  void CreateMirrorWindowIfAny();
+
 private:
   FRIEND_TEST_ALL_PREFIXES(ExtendedDesktopTest, ConvertPoint);
   FRIEND_TEST_ALL_PREFIXES(DisplayManagerTest, TestNativeDisplaysChanged);
   FRIEND_TEST_ALL_PREFIXES(DisplayManagerTest,
                            NativeDisplaysChangedAfterPrimaryChange);
   FRIEND_TEST_ALL_PREFIXES(DisplayManagerTest, AutomaticOverscanInsets);
   friend class ash::AcceleratorControllerTest;
   friend class test::DisplayManagerTestApi;
   friend class test::SystemGestureEventFilterTest;
   friend class DisplayManagerTest;
@@ skipping 63 matching lines @@
 
   bool software_mirroring_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_MANAGER_H_