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

ash/wm/gestures/long_press_affordance_handler.cc

Index: ash/wm/gestures/long_press_affordance_handler.cc
diff --git a/ash/wm/gestures/long_press_affordance_handler.cc b/ash/wm/gestures/long_press_affordance_handler.cc
index 5c4e09d2cf53ff29f562a235b96bbac7f7bc7bc6..35b4f53af84b855b42110edc2d0ede839fe2da70 100644
--- a/ash/wm/gestures/long_press_affordance_handler.cc
+++ b/ash/wm/gestures/long_press_affordance_handler.cc
@@ -203,9 +203,9 @@ class LongPressAffordanceHandler::LongPressAffordanceView
     gfx::Transform scale;
     scale.SetScale(current_scale_, current_scale_);
     // We want to scale from the center.
-    canvas->Translate(gfx::Point(center.x(), center.y()));
+    canvas->Translate(gfx::Vector2d(center.x(), center.y()));

[sky, 2012/10/26 21:37:50]

This too feels cumbersome. If we're saying a distance is represented by a Vector
shouldn't |center| be a vector?

[Peter Kasting, 2012/10/26 21:50:12]

Seems like this should be:

  canvas->Translate(center.DistanceFromOrigin());

[danakj, 2012/10/26 21:59:43]

Ya certainly, or just have

gfx::Vector2d centerOffset(width / 2, height / 2); and then pass that directly.

[Peter Kasting, 2012/10/26 22:04:06]

The reason I didn't do this is because |center| is also used below.  Of course,
perhaps those uses would also prefer vectors, I don't know.

     canvas->Transform(scale);
-    canvas->Translate(gfx::Point(-center.x(), -center.y()));
+    canvas->Translate(gfx::Vector2d(-center.x(), -center.y()));
 
     // Paint affordance glow
     int start_radius = kAffordanceInnerRadius - kAffordanceGlowWidth;