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

chrome/browser/ui/views/omnibox/omnibox_view_win.cc

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.cc
diff --git a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
index 62b4c97d279191a424a5f15d4a13cc66a2ef9e77..85aaae4a8b217cd534586598b237d6d0efe02de0 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
+++ b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
@@ -121,8 +121,8 @@ struct AutocompleteEditState : public base::SupportsUserData::Data {
 // Returns true if the current point is far enough from the origin that it
 // would be considered a drag.
 bool IsDrag(const POINT& origin, const POINT& current) {
-  return views::View::ExceededDragThreshold(current.x - origin.x,
-                                            current.y - origin.y);
+  return views::View::ExceededDragThreshold(
+      gfx::Point(current) - gfx::Point(origin));
 }
 
 // Write |text| and an optional |url| to the clipboard.