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 68c0e0e752db76243a8ebe287d17b119b2f52c84..7345e71a3ec6e14d61efad8e537f6efe64b9b80e 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -827,7 +827,7 @@ 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);