Update shelf spacing in Chrome OS according to the MD specs

ash/shelf/shelf_constants.cc

 // Copyright 2013 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/material_design/material_design_controller.h"

[tdanderson, 2016/06/05 21:57:07]

nit: the corresponding .h should always be first in a .cc's include order. So
this should look like:

#include "ash/shelf/shelf_constants.h"
<blank line>
#include "ash/material_design/material_design_controller.h"
#include "base/logging.h"

[yiyix, 2016/06/10 19:26:04]

Done.

 #include "ash/shelf/shelf_constants.h"
+#include "base/logging.h"
 
 namespace ash {
 
 const int kInvalidImageResourceID = -1;
-const int kShelfSize = 47;
-const int kShelfButtonSpacing = 10;
-const int kShelfButtonSize = 44;
+const int kWorkspaceAreaVisibleInset = 2;
+const int kWorkspaceAreaAutoHideInset = 5;
+const int kAutoHideSize = 3;
+const int kShelfItemInset = 3;
+
+int GetShelfLayoutConstant(ShelfLayoutConstant constant) {
+  const int kShelfSize[] = {47, 48};
+  const int kShelfButtonSpacing[] = {10, 16};
+  const int kShelfButtonSize[] = {44, 48};
+
+  int mode = MaterialDesignController::IsShelfMaterial()
+                 ? MaterialDesignController::Mode::MATERIAL_NORMAL
+                 : MaterialDesignController::Mode::NON_MATERIAL;
+
+  switch (constant) {
+    case SHELF_SIZE:
+      return kShelfSize[mode];
+    case SHELF_BUTTON_SPACING:
+      return kShelfButtonSpacing[mode];
+    case SHELF_BUTTON_SIZE:
+      return kShelfButtonSize[mode];
+  }
+  NOTREACHED();
+  return 0;
+}
 
 }  // namespace ash