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());

[danakj, 2012/10/26 23:30:34]

We probably want something like GetClientAreaOffsetInScreen() on Widget..

[Peter Kasting, 2012/10/26 23:50:16]

Yes.  I think pretty much any function which has "InScreen" or "ToScreen" or
"FromScreen" anywhere are probably all candidates to convert.  For Widget, if we
can access the client area offset and the client bounds size (or the client
bounds rect in client coordinates, i.e. starting at the origin), we can compute
the client bounds rect in screen coordinates where needed.

   }
 }
 
@@ -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);
     }