Add Vector2d classes that represent offsets, instead of using Point.

chrome/browser/notifications/balloon.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.
 
 // Handles the visible notification (or balloons).
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_H_
 
 #include "base/basictypes.h"
@@ skipping 45 matching lines @@
   virtual ~Balloon();
 
   const Notification& notification() const { return *notification_.get(); }
   Profile* profile() const { return profile_; }
 
   gfx::Point GetPosition() const {
     return position_.Add(offset_);
   }
   void SetPosition(const gfx::Point& upper_left, bool reposition);
 
-  const gfx::Point& offset() { return offset_;}
-  void set_offset(const gfx::Point& offset) { offset_ = offset; }
-  void add_offset(const gfx::Point& offset) { offset_ = offset_.Add(offset); }
+  const gfx::Vector2d& offset() { return offset_;}
+  void set_offset(const gfx::Vector2d& offset) { offset_ = offset; }
+  void add_offset(const gfx::Vector2d& offset) { offset_.Add(offset); }
 
   const gfx::Size& content_size() const { return content_size_; }
   void set_content_size(const gfx::Size& size) { content_size_ = size; }
 
   const BalloonCollection* collection() const { return collection_; }
 
   const gfx::Size& min_scrollbar_size() const { return min_scrollbar_size_; }
   void set_min_scrollbar_size(const gfx::Size& size) {
     min_scrollbar_size_ = size;
   }
@@ skipping 40 matching lines @@
 
   // The actual UI element for the balloon.
   scoped_ptr<BalloonView> balloon_view_;
 
   // Position and size of the balloon on the screen.
   gfx::Point position_;
   gfx::Size content_size_;
 
   // Temporary offset for balloons that need to be positioned in a non-standard
   // position for keeping the close buttons under the mouse cursor.
-  gfx::Point offset_;
+  gfx::Vector2d offset_;
 
   // Smallest size for this balloon where scrollbars will be shown.
   gfx::Size min_scrollbar_size_;
 
   DISALLOW_COPY_AND_ASSIGN(Balloon);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_H_