Add left/right layout support for uber tray.

ash/system/tray/tray_constants.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/system/tray/tray_constants.h"
 
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace ash {
 
-const int kPaddingFromRightEdgeOfScreen = 15;
-const int kPaddingFromBottomOfScreen = 10;
+const int kPaddingFromRightEdgeOfScreenBottomAlignment = 15;
+const int kPaddingFromBottomOfScreenBottomAlignment = 10;
+const int kPaddingFromLeftEdgeOfScreenLeftAlignment = 13;
+const int kPaddingFromRightEdgeOfScreenRightAlignment = 2;
+const int kPaddingFromBottomOfScreenVerticalAlignment = 9;
 
 const int kTrayPopupAutoCloseDelayInSeconds = 2;
 const int kTrayPopupAutoCloseDelayForTextInSeconds = 5;
 const int kTrayPopupPaddingHorizontal = 18;
 const int kTrayPopupPaddingBetweenItems = 10;
 const int kTrayPopupTextSpacingVertical = 4;
 
 const int kTrayPopupItemHeight = 48;
 const int kTrayPopupDetailsIconWidth = 27;
 const int kTrayRoundedBorderRadius = 2;
@@ skipping 10 matching lines @@
 
 const SkColor kFocusBorderColor = SkColorSetRGB(64, 128, 250);
 
 const SkColor kHeaderTextColorNormal = SkColorSetARGB(0x7f, 0, 0, 0);
 const SkColor kHeaderTextColorHover = SkColorSetARGB(0xd3, 0, 0, 0);
 
 const int kTrayPopupWidth = 300;
 const int kNotificationCloseButtonWidth = 60;
 
 }  // namespace ash