Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

ui/views/widget/desktop_aura/desktop_screen_x11.cc

 // 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.
 
 #include "ui/views/widget/desktop_aura/desktop_screen.h"
 
 #include <X11/Xlib.h>
 
 // It clashes with out RootWindow.
 #undef RootWindow
@@ skipping 29 matching lines @@
   virtual gfx::Point GetCursorScreenPoint() OVERRIDE;
   virtual gfx::NativeWindow GetWindowAtCursorScreenPoint() OVERRIDE;
   virtual int GetNumDisplays() OVERRIDE;
   virtual gfx::Display GetDisplayNearestWindow(
       gfx::NativeView window) const OVERRIDE;
   virtual gfx::Display GetDisplayNearestPoint(
       const gfx::Point& point) const OVERRIDE;
   virtual gfx::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const OVERRIDE;
   virtual gfx::Display GetPrimaryDisplay() const OVERRIDE;
+  virtual void AddObserver(gfx::DisplayObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DesktopScreenX11);
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopScreenX11, public:
 
 DesktopScreenX11::DesktopScreenX11() {
 }
@@ skipping 55 matching lines @@
     const gfx::Rect& match_rect) const {
   // TODO(erg): Do the right thing once we know what that is.
   return gfx::Display(0, gfx::Rect(GetPrimaryDisplaySize()));
 }
 
 gfx::Display DesktopScreenX11::GetPrimaryDisplay() const {
   // TODO(erg): Do the right thing once we know what that is.
   return gfx::Display(0, gfx::Rect(GetPrimaryDisplaySize()));
 }
 
+void DesktopScreenX11::AddObserver(gfx::DisplayObserver* observer) {
+  // TODO(erg|oshima): Do the right thing once we know what that is.
+  // crbug.com/122863
+}
+void DesktopScreenX11::RemoveObserver(gfx::DisplayObserver* observer) {
+  // TODO(erg|oshima): Do the right thing once we know what that is.
+  // crbug.com/122863
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace views {
 
 gfx::Screen* CreateDesktopScreen() {
   return new DesktopScreenX11;
 }
 
 }  // namespace views