ui: Add methods to Rect classes to get points at each of the rect's corners.

ui/gfx/rect_base.h

Index: ui/gfx/rect_base.h
diff --git a/ui/gfx/rect_base.h b/ui/gfx/rect_base.h
index 3ad12c8b245b2cccc0e81706af8f4123083009d0..9c057a107fa3adb338c01bace62eddd5ee6e1a3d 100644
--- a/ui/gfx/rect_base.h
+++ b/ui/gfx/rect_base.h
@@ -47,6 +47,11 @@ class UI_EXPORT RectBase {
   Type right() const { return x() + width(); }
   Type bottom() const { return y() + height(); }
 
+  PointClass TopLeft() const { return PointClass(x(), y()); }

[sky, 2012/11/14 22:23:43]

This is the same as origin(), do we really need it?

[danakj, 2012/11/14 22:36:34]

It's true, we don't. I liked having consistency so you could for instance
BottomRight() - TopLeft(), and use the same vocabulary throughout.

I can remove it if you like though.

+  PointClass TopRight() const { return PointClass(right(), y()); }

[sky, 2012/11/14 22:23:43]

Can these be named unix_hacker style?

[danakj, 2012/11/14 22:36:34]

Done.

+  PointClass BottomLeft() const { return PointClass(x(), bottom()); }
+  PointClass BottomRight() const { return PointClass(right(), bottom()); }
+
   VectorClass OffsetFromOrigin() const {
     return VectorClass(x(), y());
   }