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

ui/views/painter.cc

Index: ui/views/painter.cc
diff --git a/ui/views/painter.cc b/ui/views/painter.cc
index 4275c549a5b6db50b76afa7d6522b3b8c5d9f4f4..99c537c310344d2cc341dccbf99b1cfc65d02a98 100644
--- a/ui/views/painter.cc
+++ b/ui/views/painter.cc
@@ -171,7 +171,7 @@ void Painter::PaintPainterAt(gfx::Canvas* canvas,
                              const gfx::Rect& rect) {
   DCHECK(canvas && painter);
   canvas->Save();
-  canvas->Translate(rect.origin());
+  canvas->Translate(rect.OffsetFromOrigin());
   painter->Paint(canvas, rect.size());
   canvas->Restore();
 }