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

ash/launcher/overflow_bubble.cc

 // 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.
 
 #include "ash/launcher/overflow_bubble.h"
 
 #include <algorithm>
 
 #include "ash/launcher/launcher_types.h"
 #include "ash/launcher/launcher_view.h"
@@ skipping 66 matching lines @@
   virtual void Layout() OVERRIDE;
   virtual void ChildPreferredSizeChanged(views::View* child) OVERRIDE;
   virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
   virtual bool OnScrollEvent(const ui::ScrollEvent& event) OVERRIDE;
 
   // views::BubbleDelegate overrides:
   virtual gfx::Rect GetBubbleBounds() OVERRIDE;
 
   ShelfAlignment shelf_alignment_;
   LauncherView* launcher_view_;  // Owned by views hierarchy.
-  gfx::Point scroll_offset_;
+  gfx::Vector2d scroll_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(OverflowBubbleView);
 };
 
 OverflowBubbleView::OverflowBubbleView()
     : shelf_alignment_(SHELF_ALIGNMENT_BOTTOM),
       launcher_view_(NULL) {
 }
 
 OverflowBubbleView::~OverflowBubbleView() {
@@ skipping 61 matching lines @@
           preferred_size.height(),
           static_cast<int>(monitor_rect.height() *
                            kMaxBubbleSizeToScreenRatio)));
     }
   }
 
   return preferred_size;
 }
 
 void OverflowBubbleView::Layout() {
-  const gfx::Point origin(-scroll_offset_.x(), -scroll_offset_.y());
+  const gfx::Point origin(gfx::PointAtDistanceFromOrigin(-scroll_offset_));
   launcher_view_->SetBoundsRect(gfx::Rect(origin, GetContentsSize()));
 }
 
 void OverflowBubbleView::ChildPreferredSizeChanged(views::View* child) {
   // Ensures |launch_view_| is still visible.
   ScrollByXOffset(0);
   ScrollByYOffset(0);
   Layout();
 
   SizeToContents();
@@ skipping 100 matching lines @@
   bubble_ = NULL;
 }
 
 void OverflowBubble::OnWidgetClosing(views::Widget* widget) {
   DCHECK(widget == bubble_->GetWidget());
   bubble_ = NULL;
 }
 
 }  // namespace internal
 }  // namespace ash