New InputMethod api for Views.

views/widget/widget.h

Index: views/widget/widget.h
diff --git a/views/widget/widget.h b/views/widget/widget.h
index cb6a3ce19521d017b80115c2b75850b3a19ef408..3c32fc3e37726a662b6b740323d477059e29eed5 100644
--- a/views/widget/widget.h
+++ b/views/widget/widget.h
@@ -92,6 +92,14 @@ class Widget : public internal::NativeWidgetDelegate,
   // view hierarchies that the locale has changed.
   static void NotifyLocaleChanged();
 
+  // Converts a rectangle from one Widget's coordinate system to another's.
+  // Returns false if the conversion couldn't be made, because either these two
+  // Widgets do not have a common ancestor or they are not on the screen yet.
+  // The value of |*rect| won't be changed when false is returned.
+  static bool ConvertRect(const Widget* source,
+                          const Widget* target,
+                          gfx::Rect* rect);
+
   // Unconverted methods -------------------------------------------------------
 
   // TODO(beng):