Adds View::GetNativeTheme() to get the NativeTheme. The interesting

ui/views/widget/native_widget_private.h

Index: ui/views/widget/native_widget_private.h
diff --git a/ui/views/widget/native_widget_private.h b/ui/views/widget/native_widget_private.h
index c210a20734862a0085901a0b0b53aba8cc993c2f..f86da8754e65029d24d5384e39fd2fe1d448f424 100644
--- a/ui/views/widget/native_widget_private.h
+++ b/ui/views/widget/native_widget_private.h
@@ -17,6 +17,7 @@ class Rect;
 }
 
 namespace ui {
+class NativeTheme;
 class OSExchangeData;
 }
 
@@ -214,6 +215,7 @@ class VIEWS_EXPORT NativeWidgetPrivate : public NativeWidget {
       const gfx::Vector2d& drag_offset) = 0;
   virtual void EndMoveLoop() = 0;
   virtual void SetVisibilityChangedAnimationsEnabled(bool value) = 0;
+  virtual ui::NativeTheme* GetNativeTheme() = 0;
 
   // Overridden from NativeWidget:
   virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() OVERRIDE;