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

ui/base/gestures/gesture_recognizer_impl.cc

Index: ui/base/gestures/gesture_recognizer_impl.cc
diff --git a/ui/base/gestures/gesture_recognizer_impl.cc b/ui/base/gestures/gesture_recognizer_impl.cc
index 78adfab9c0e6a1b0649a75ecd68f7320a29f96a1..993ae5b747b11bffd871d63b54b0233d4f176ddf 100644
--- a/ui/base/gestures/gesture_recognizer_impl.cc
+++ b/ui/base/gestures/gesture_recognizer_impl.cc
@@ -132,8 +132,8 @@ GestureConsumer* GestureRecognizerImpl::GetTargetForLocation(
     for (int j = 0; j < GestureSequence::kMaxGesturePoints; ++j) {
       if (!points[j].in_use())
         continue;
-      gfx::Point delta =
-          points[j].last_touch_position().Subtract(location);
+      gfx::Point delta = points[j].last_touch_position().Subtract(
+          location.DistanceFromOrigin());
       int distance = delta.x() * delta.x() + delta.y() * delta.y();
       if (!closest_point || distance < closest_distance_squared) {
         closest_point = &points[j];