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

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index fd1ac7f79ab0fc023a3c2827f1b4eaa880f4fa30..b274473ad1307a6211b6f2b740e39e733469a72c 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -623,7 +623,7 @@ void View::ConvertPointToTarget(const View* source,
   // API defines NULL |source| as returning the point in screen coordinates.
   if (!source) {
     *point = point->Subtract(
-        root->GetWidget()->GetClientAreaBoundsInScreen().origin());
+        root->GetWidget()->GetClientAreaBoundsInScreen().DistanceFromOrigin());
   }
 }
 
@@ -673,7 +673,7 @@ void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) {
 gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const {
   gfx::Rect x_rect = rect;
   GetTransform().TransformRect(&x_rect);
-  x_rect.Offset(GetMirroredPosition());
+  x_rect.Offset(GetMirroredPosition().DistanceFromOrigin());
   return x_rect;
 }
 
@@ -724,7 +724,7 @@ void View::Paint(gfx::Canvas* canvas) {
 
   // Non-empty clip, translate the graphics such that 0,0 corresponds to
   // where this view is located (related to its parent).
-  canvas->Translate(GetMirroredPosition());
+  canvas->Translate(GetMirroredPosition().DistanceFromOrigin());
   canvas->Transform(GetTransform());
 
   PaintCommon(canvas);
@@ -1526,7 +1526,7 @@ void View::PaintCommon(gfx::Canvas* canvas) {
     // request the canvas to be flipped.
     ScopedCanvas scoped(canvas);
     if (FlipCanvasOnPaintForRTLUI()) {
-      canvas->Translate(gfx::Point(width(), 0));
+      canvas->Translate(gfx::Vector2d(width(), 0));
       canvas->Scale(-1, 1);
     }