Add left/right layout support for uber tray.

ash/wm/status_area_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/status_area_layout_manager.h"
 
 #include "ash/wm/shelf_layout_manager.h"
 #include "base/auto_reset.h"
 #include "ui/aura/window.h"
 #include "ui/views/widget/widget.h"
@@ skipping 38 matching lines @@
     const gfx::Rect& requested_bounds) {
   // Only need to have the shelf do a layout if the child changing is the status
   // area and the shelf isn't in the process of doing a layout.
   if (child != shelf_->status()->GetNativeView() || in_layout_) {
     SetChildBoundsDirect(child, requested_bounds);
     return;
   }
 
   // If the size matches, no need to do anything. We don't check the location as
   // that is managed by the shelf.
-  if (requested_bounds.size() == child->bounds().size())
+  if (requested_bounds == child->bounds())

[sadrul, 2012/05/17 19:57:05]

Is this change because the size doesn't change when switching between left/right
alignment but we still need to relayout?

[jennyz, 2012/05/17 22:13:30]

Yes. 

     return;
 
   SetChildBoundsDirect(child, requested_bounds);
   LayoutStatusArea();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // StatusAreaLayoutManager, private:
 
 void StatusAreaLayoutManager::LayoutStatusArea() {
   // Shelf layout manager may be already doing layout.
   if (shelf_->in_layout())
     return;
 
   AutoReset<bool> auto_reset_in_layout(&in_layout_, true);
   shelf_->LayoutShelf();
 }
 
 }  // namespace internal
 }  // namespace ash