Start the move of launcher_types.h to shelf.

ash/shelf/shelf_constants.h

Index: ash/shelf/shelf_constants.h
diff --git a/ash/shelf/shelf_constants.h b/ash/shelf/shelf_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..76967748deb276664924863d3d2f40f2cd62b0f0
--- /dev/null
+++ b/ash/shelf/shelf_constants.h
@@ -0,0 +1,28 @@
+// 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.
+
+#ifndef ASH_SHELF_SHELF_CONSTANTS_H_
+#define ASH_SHELF_SHELF_CONSTANTS_H_
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+// Height of the shelf. Hard coded to avoid resizing as items are added/removed.
+ASH_EXPORT extern const int kShelfPreferredSize;
+
+// Max alpha of the shelf background.
+ASH_EXPORT extern const int kShelfBackgroundAlpha;
+
+// Invalid image resource id used for LauncherItemDetails.
+extern const int kInvalidImageResourceID;
+
+extern const int kInvalidShelfID;
+
+// Animation duration for switching black shelf and dock background on and off.
+ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;
+
+}  // namespace ash
+
+#endif  // ASH_SHELF_SHELF_CONSTANTS_H_