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

content/browser/web_contents/web_contents_view_aura.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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
@@ skipping 419 matching lines @@
                                         bool right_aligned,
                                         bool allow_multiple_selection) {
   // External popup menus are only used on Mac and Android.
   NOTIMPLEMENTED();
 }
 
 void WebContentsViewAura::StartDragging(
     const WebDropData& drop_data,
     WebKit::WebDragOperationsMask operations,
     const gfx::ImageSkia& image,
-    const gfx::Point& image_offset) {
+    const gfx::Vector2d& image_offset) {
   aura::RootWindow* root_window = GetNativeView()->GetRootWindow();
   if (!aura::client::GetDragDropClient(root_window))
     return;
 
   ui::OSExchangeDataProviderAura* provider = new ui::OSExchangeDataProviderAura;
   PrepareDragData(drop_data, provider);
   if (!image.isNull()) {
     provider->set_drag_image(image);
     provider->set_drag_image_offset(image_offset);
   }
@@ skipping 235 matching lines @@
       event.location(),
       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   current_drop_data_.reset();
   return current_drag_op_;
 }
 
 }  // namespace content