Update Windows UI on system color changes.

ui/views/widget/widget.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_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/scoped_observer.h"
 #include "ui/aura/window_layer_type.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/events/event_source.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/rect.h"
+#include "ui/native_theme/native_theme.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/widget/native_widget_delegate.h"
 #include "ui/views/window/client_view.h"
 #include "ui/views/window/non_client_view.h"
 
 #if defined(OS_WIN)
 // Windows headers define macros for these function names which screw with us.
 #if defined(IsMaximized)
 #undef IsMaximized
 #endif
 #if defined(IsMinimized)
 #undef IsMinimized
 #endif
 #if defined(CreateWindow)
 #undef CreateWindow
 #endif
 #endif
 
 namespace gfx {
 class Canvas;
 class Point;
 class Rect;
 }
 
 namespace ui {
 class Accelerator;
 class Compositor;
 class DefaultThemeProvider;
 class Layer;
-class NativeTheme;
 class OSExchangeData;
 class ThemeProvider;
 }
 
 namespace views {
 
 class DesktopWindowTreeHost;
 class InputMethod;
 class NativeWidget;
 class NonClientFrameView;
@@ skipping 28 matching lines @@
 //      is destroyed (in response to a native destruction message), it deletes
 //      the Widget from its destructor.
 //    ownership = WIDGET_OWNS_NATIVE_WIDGET (non-default)
 //      The Widget instance owns its NativeWidget. This state implies someone
 //      else wants to control the lifetime of this object. When they destroy
 //      the Widget it is responsible for destroying the NativeWidget (from its
 //      destructor).
 //
 class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
                             public ui::EventSource,
-                            public FocusTraversable {
+                            public FocusTraversable,
+                            public ui::NativeThemeObserver {
  public:
   typedef std::set<Widget*> Widgets;
 
   enum FrameType {
     FRAME_TYPE_DEFAULT,         // Use whatever the default would be.
     FRAME_TYPE_FORCE_CUSTOM,    // Force the custom frame.
     FRAME_TYPE_FORCE_NATIVE     // Force the native frame.
   };
 
   // Result from RunMoveLoop().
@@ skipping 645 matching lines @@
   virtual bool SetInitialFocus(ui::WindowShowState show_state) OVERRIDE;
 
   // Overridden from ui::EventSource:
   virtual ui::EventProcessor* GetEventProcessor() OVERRIDE;
 
   // Overridden from FocusTraversable:
   virtual FocusSearch* GetFocusSearch() OVERRIDE;
   virtual FocusTraversable* GetFocusTraversableParent() OVERRIDE;
   virtual View* GetFocusTraversableParentView() OVERRIDE;
 
+  // Overridden from ui::NativeThemeObserver:
+  virtual void OnNativeThemeUpdate() OVERRIDE;
+
  protected:
   // Creates the RootView to be used within this Widget. Subclasses may override
   // to create custom RootViews that do specialized event processing.
   // TODO(beng): Investigate whether or not this is needed.
   virtual internal::RootView* CreateRootView();
 
   // Provided to allow the NativeWidget implementations to destroy the RootView
   // _before_ the focus manager/tooltip manager.
   // TODO(beng): remove once we fold those objects onto this one.
   void DestroyRootView();
@@ skipping 125 matching lines @@
   // See description in GetRootLayers().
   std::vector<ui::Layer*> root_layers_;
 
   // Is |root_layers_| out of date?
   bool root_layers_dirty_;
 
   // True when window movement via mouse interaction with the frame should be
   // disabled.
   bool movement_disabled_;
 
+  ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_