Update Windows UI on system color changes.

ui/views/widget/root_view.h

Index: ui/views/widget/root_view.h
diff --git a/ui/views/widget/root_view.h b/ui/views/widget/root_view.h
index ea8da5fdd9217ddfc022793b814d0526e89bfcc7..df9a4529ff983650f81d2e3d9683befd41a4d056 100644
--- a/ui/views/widget/root_view.h
+++ b/ui/views/widget/root_view.h
@@ -9,6 +9,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "ui/events/event_processor.h"
+#include "ui/native_theme/native_theme.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/focus/focus_search.h"
 #include "ui/views/view.h"
@@ -45,7 +46,8 @@ class PreEventDispatchHandler;
 //
 class VIEWS_EXPORT RootView : public View,
                               public FocusTraversable,
-                              public ui::EventProcessor {
+                              public ui::EventProcessor,
+                              public ui::NativeThemeObserver {
  public:
   static const char kViewClassName[];
 
@@ -109,6 +111,9 @@ class VIEWS_EXPORT RootView : public View,
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
   virtual void UpdateParentLayer() OVERRIDE;
 
+  // Overridden from ui::NativeThemeObserver:
+  virtual void OnNativeThemeChange() OVERRIDE;
+
  protected:
   virtual void DispatchGestureEvent(ui::GestureEvent* event);