Experimental alignment layout manager using a property on the views

ui/views/view.h

Index: ui/views/view.h
diff --git a/ui/views/view.h b/ui/views/view.h
index 572d3a55f0487c33d11ef164b203bcb513cce133..518a15eeb2f356164cf855abd293ef19db36eb90 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -36,6 +36,7 @@
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/path.h"
+#include "ui/views/attributes.h"
 #include "ui/views/view_targeter.h"
 #include "ui/views/views_export.h"
 
@@ -401,6 +402,9 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
 
   // Attributes ----------------------------------------------------------------
 
+  // Returns this view's custom attribute container
+  AttributeContainer& attributes() { return attributes_; }
+
   // The view class name.
   static const char kViewClassName[];
 
@@ -1466,6 +1470,11 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   // Whether this view is enabled.
   bool enabled_;
 
+  // Container which holds any number of custom attributes used for various
+  // reasons, such as custom alignment and anchoring of the control within
+  // its parent.
+  AttributeContainer attributes_;
+
   // When this flag is on, a View receives a mouse-enter and mouse-leave event
   // even if a descendant View is the event-recipient for the real mouse
   // events. When this flag is turned on, and mouse moves from outside of the