Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

 // Copyright 2014 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/system/chromeos/virtual_keyboard/virtual_keyboard_tray.h"
 
 #include "ash/keyboard/keyboard_ui.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_util.h"
@@ skipping 28 matching lines @@
   if (Shell::HasInstance())
     Shell::GetInstance()->keyboard_ui()->AddObserver(this);
 }
 
 VirtualKeyboardTray::~VirtualKeyboardTray() {
   // The Shell may not exist in some unit tests.
   if (Shell::HasInstance())
     Shell::GetInstance()->keyboard_ui()->RemoveObserver(this);
 }
 
-void VirtualKeyboardTray::SetShelfAlignment(ShelfAlignment alignment) {
+void VirtualKeyboardTray::SetShelfAlignment(wm::ShelfAlignment alignment) {
   TrayBackgroundView::SetShelfAlignment(alignment);
   tray_container()->SetBorder(views::Border::NullBorder());
 
   // Pad button size to align with other controls in the system tray.
   const gfx::ImageSkia image = button_->GetImage(
       views::CustomButton::STATE_NORMAL);
   int top_padding = (kTrayBarButtonWidth - image.height()) / 2;
   int left_padding = (kTrayBarButtonWidth - image.width()) / 2;
   int bottom_padding = kTrayBarButtonWidth - image.height() - top_padding;
   int right_padding = kTrayBarButtonWidth - image.width() - left_padding;
@@ skipping 37 matching lines @@
                                         const ui::Event& event) {
   DCHECK_EQ(button_, sender);
   PerformAction(event);
 }
 
 void VirtualKeyboardTray::OnKeyboardEnabledStateChanged(bool new_value) {
   SetVisible(Shell::GetInstance()->keyboard_ui()->IsEnabled());
 }
 
 }  // namespace ash