Refactors WindowResizers to use ash/wm/common

ash/wm/common/shelf/wm_shelf_util.cc

Index: ash/wm/common/shelf/wm_shelf_util.cc
diff --git a/ash/wm/common/shelf/wm_shelf_constants.cc b/ash/wm/common/shelf/wm_shelf_util.cc
similarity index 52%
copy from ash/wm/common/shelf/wm_shelf_constants.cc
copy to ash/wm/common/shelf/wm_shelf_util.cc
index fa0425c97a671ec2b850a611e87ee3aa395e90e6..5133feb7600ddba33547cf43974d2ab5edcd4bc6 100644
--- a/ash/wm/common/shelf/wm_shelf_constants.cc
+++ b/ash/wm/common/shelf/wm_shelf_util.cc
@@ -2,13 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/wm/common/shelf/wm_shelf_constants.h"
+#include "ash/wm/common/shelf/wm_shelf_util.h"
 
 namespace ash {
 namespace wm {
 
-const int kShelfBackgroundAlpha = 204;
-const int kTimeToSwitchBackgroundMs = 1000;
+bool IsHorizontalAlignment(wm::ShelfAlignment alignment) {
+  return alignment == wm::SHELF_ALIGNMENT_BOTTOM ||
+         alignment == wm::SHELF_ALIGNMENT_BOTTOM_LOCKED;
+}
 
 }  // namespace wm
 }  // namespace ash