Add ability for Widgets to override the DefaultThemeProvider

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>
@@ skipping 536 matching lines @@
     is_secondary_widget_ = is_secondary_widget;
   }
   bool is_secondary_widget() const { return is_secondary_widget_; }
 
   // Returns whether the Widget is visible to the user.
   virtual bool IsVisible() const;
 
   // Returns the ThemeProvider that provides theme resources for this Widget.
   virtual ui::ThemeProvider* GetThemeProvider() const;
 
+  // Sets the ThemeProvider which provides theme resources for this Widget.
+  // Widget does not take ownership.
+  void SetThemeProvider(ui::ThemeProvider* theme_provider);
+
   ui::NativeTheme* GetNativeTheme() {
     return const_cast<ui::NativeTheme*>(
         const_cast<const Widget*>(this)->GetNativeTheme());
   }
   const ui::NativeTheme* GetNativeTheme() const;
 
   // Returns the FocusManager for this widget.
   // Note that all widgets in a widget hierarchy share the same focus manager.
   FocusManager* GetFocusManager();
   const FocusManager* GetFocusManager() const;
@@ skipping 310 matching lines @@
 
   // The focus manager keeping track of focus for this Widget and any of its
   // children.  NULL for non top-level widgets.
   // WARNING: RootView's destructor calls into the FocusManager. As such, this
   // must be destroyed AFTER root_view_. This is enforced in DestroyRootView().
   scoped_ptr<FocusManager> focus_manager_;
 
   // A theme provider to use when no other theme provider is specified.
   scoped_ptr<ui::DefaultThemeProvider> default_theme_provider_;
 
+  // The theme provider to use if specified. Otherwise |default_theme_provider_|
+  // is provided. This is not owned by Widget.
+  ui::ThemeProvider* theme_provider_;
+
   // Valid for the lifetime of RunShellDrag(), indicates the view the drag
   // started from.
   View* dragged_view_;
 
   // See class documentation for Widget above for a note about ownership.
   InitParams::Ownership ownership_;
 
   // See set_is_secondary_widget().
   bool is_secondary_widget_;
 
@@ skipping 59 matching lines @@
   bool movement_disabled_;
 
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_