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

content/browser/web_contents/web_contents_drag_win.cc

Index: content/browser/web_contents/web_contents_drag_win.cc
diff --git a/content/browser/web_contents/web_contents_drag_win.cc b/content/browser/web_contents/web_contents_drag_win.cc
index 95106178b63f7029a744051ac51a399fdb48c084..adc4cec9d285dabf340345e88a4028956ab9192d 100644
--- a/content/browser/web_contents/web_contents_drag_win.cc
+++ b/content/browser/web_contents/web_contents_drag_win.cc
@@ -155,7 +155,7 @@ WebContentsDragWin::~WebContentsDragWin() {
 void WebContentsDragWin::StartDragging(const WebDropData& drop_data,
                                        WebDragOperationsMask ops,
                                        const gfx::ImageSkia& image,
-                                       const gfx::Point& image_offset) {
+                                       const gfx::Vector2d& image_offset) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   drag_source_ = new WebDragSource(source_window_, web_contents_);
@@ -193,7 +193,7 @@ void WebContentsDragWin::StartBackgroundDragging(
     const GURL& page_url,
     const std::string& page_encoding,
     const gfx::ImageSkia& image,
-    const gfx::Point& image_offset) {
+    const gfx::Vector2d& image_offset) {
   drag_drop_thread_id_ = base::PlatformThread::CurrentId();
 
   if (DoDragging(drop_data, ops, page_url, page_encoding,
@@ -308,7 +308,7 @@ bool WebContentsDragWin::DoDragging(const WebDropData& drop_data,
                                     const GURL& page_url,
                                     const std::string& page_encoding,
                                     const gfx::ImageSkia& image,
-                                    const gfx::Point& image_offset) {
+                                    const gfx::Vector2d& image_offset) {
   ui::OSExchangeData data;
 
   if (!drop_data.download_metadata.empty()) {