Add origin() method on View and use it to simplify some callers.

ui/views/view.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_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 222 matching lines @@
   void SetPosition(const gfx::Point& position);
   void SetX(int x);
   void SetY(int y);
 
   // No transformation is applied on the size or the locations.
   const gfx::Rect& bounds() const { return bounds_; }
   int x() const { return bounds_.x(); }
   int y() const { return bounds_.y(); }
   int width() const { return bounds_.width(); }
   int height() const { return bounds_.height(); }
+  const gfx::Point& origin() const { return bounds_.origin(); }
   const gfx::Size& size() const { return bounds_.size(); }
 
   // Returns the bounds of the content area of the view, i.e. the rectangle
   // enclosed by the view's border.
   gfx::Rect GetContentsBounds() const;
 
   // Returns the bounds of the view in its own coordinates (i.e. position is
   // 0, 0).
   gfx::Rect GetLocalBounds() const;
 
@@ skipping 1348 matching lines @@
   // Observers -------------------------------------------------------------
 
   base::ObserverList<ViewObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_