Add origin() method on View and use it to simplify some callers.

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index 92223157d4c8671aaa2c55aab4c006d1ee25b265..f34be88ea2f2f7c972dc42f3d4ff584ee5e5c996 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -786,7 +786,7 @@ void View::Paint(const ui::PaintContext& parent_context) {
   if (!layer()) {
     // If the View has a layer() then it is a paint root. Otherwise, we need to
     // add the offset from the parent into the total offset from the paint root.
-    DCHECK(parent() || bounds().origin() == gfx::Point());
+    DCHECK(parent() || origin() == gfx::Point());
     offset_to_parent = GetMirroredPosition().OffsetFromOrigin();
   }
   ui::PaintContext context(parent_context, offset_to_parent);