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

chrome/browser/ui/views/bookmarks/bookmark_bar_view.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 "chrome/browser/ui/views/bookmarks/bookmark_bar_view.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <vector>
@@ skipping 987 matching lines @@
                                            const gfx::Point& press_pt,
                                            ui::OSExchangeData* data) {
   content::RecordAction(UserMetricsAction("BookmarkBar_DragButton"));
 
   for (int i = 0; i < GetBookmarkButtonCount(); ++i) {
     if (sender == GetBookmarkButton(i)) {
       views::TextButton* button = GetBookmarkButton(i);
       scoped_ptr<gfx::Canvas> canvas(
           views::GetCanvasForDragImage(button->GetWidget(), button->size()));
       button->PaintButton(canvas.get(), views::TextButton::PB_FOR_DRAG);
-      drag_utils::SetDragImageOnDataObject(*canvas, button->size(), press_pt,
+      drag_utils::SetDragImageOnDataObject(*canvas, button->size(),
+                                           press_pt.OffsetFromOrigin(),
                                            data);
       WriteBookmarkDragData(model_->bookmark_bar_node()->GetChild(i), data);
       return;
     }
   }
   NOTREACHED();
 }
 
 int BookmarkBarView::GetDragOperationsForView(View* sender,
                                               const gfx::Point& p) {
@@ skipping 15 matching lines @@
   }
   NOTREACHED();
   return ui::DragDropTypes::DRAG_NONE;
 }
 
 bool BookmarkBarView::CanStartDragForView(views::View* sender,
                                           const gfx::Point& press_pt,
                                           const gfx::Point& p) {
   // Check if we have not moved enough horizontally but we have moved downward
   // vertically - downward drag.
-  if (!View::ExceededDragThreshold(press_pt.x() - p.x(), 0) &&
-      press_pt.y() < p.y()) {
+  gfx::Vector2d move_offset = p - press_pt;
+  gfx::Vector2d horizontal_offset(move_offset.x(), 0);
+  if (!View::ExceededDragThreshold(horizontal_offset) && move_offset.y() > 0) {
     for (int i = 0; i < GetBookmarkButtonCount(); ++i) {
       if (sender == GetBookmarkButton(i)) {
         const BookmarkNode* node = model_->bookmark_bar_node()->GetChild(i);
         // If the folder button was dragged, show the menu instead.
         if (node && node->is_folder()) {
           views::MenuButton* menu_button =
               static_cast<views::MenuButton*>(sender);
           menu_button->Activate();
           return false;
         }
@@ skipping 681 matching lines @@
               (1 - size_animation_->GetCurrentValue())));
     } else {
       prefsize.set_height(
           static_cast<int>(
               browser_defaults::kBookmarkBarHeight *
               size_animation_->GetCurrentValue()));
     }
   }
   return prefsize;
 }