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

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 26 matching lines @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginAction.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupType.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 #include "ui/base/dialogs/selected_file_info.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/base/range/range.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
+#include "ui/gfx/vector2d.h"
 #include "webkit/glue/webcookie.h"
 #include "webkit/glue/webmenuitem.h"
 #include "webkit/glue/webpreferences.h"
 #include "webkit/plugins/npapi/webplugin.h"
 
 #if defined(OS_MACOSX)
 #include "content/common/mac/font_descriptor.h"
 #endif
 
 #undef IPC_MESSAGE_EXPORT
@@ skipping 495 matching lines @@
   // The scroll offset.  Only one of these can be non-zero, and if they are
   // both zero, then it means there is no scrolling and the scroll_rect is
   // ignored.
   IPC_STRUCT_MEMBER(int, dx)
   IPC_STRUCT_MEMBER(int, dy)
 
   // The rectangular region to scroll.
   IPC_STRUCT_MEMBER(gfx::Rect, scroll_rect)
 
   // The scroll offset of the render view.
-  IPC_STRUCT_MEMBER(gfx::Point, scroll_offset)
+  IPC_STRUCT_MEMBER(gfx::Vector2d, scroll_offset)
 
   // The regions of the bitmap (in view coords) that contain updated pixels.
   // In the case of scrolling, this includes the scroll damage rect.
   IPC_STRUCT_MEMBER(std::vector<gfx::Rect>, copy_rects)
 
   // The size of the RenderView when this message was generated.  This is
   // included so the host knows how large the view is from the perspective of
   // the renderer process.  This is necessary in case a resize operation is in
   // progress. If auto-resize is enabled, this should update the corresponding
   // view size.
@@ skipping 1811 matching lines @@
 IPC_MESSAGE_ROUTED1(ViewHostMsg_StartContentIntent,
                     GURL /* content_url */)
 #endif
 
 // Notifies that multiple touch targets may have been pressed, and to show
 // the disambiguation popup.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_ShowDisambiguationPopup,
                     gfx::Rect, /* Border of touched targets */
                     gfx::Size, /* Size of zoomed image */
                     TransportDIB::Id /* DIB of zoomed image */)