Start the move of launcher_types.h to shelf.

ash/shelf/shelf_constants.cc

Index: ash/shelf/shelf_constants.cc
diff --git a/ash/shelf/shelf_constants.cc b/ash/shelf/shelf_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b180496017f432c2b792a0fe5ccb89fe02094064
--- /dev/null
+++ b/ash/shelf/shelf_constants.cc
@@ -0,0 +1,15 @@
+// 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/shelf/shelf_constants.h"
+
+namespace ash {
+
+const int kShelfPreferredSize = 48;
+const int kShelfBackgroundAlpha = 204;
+const int kInvalidImageResourceID = -1;
+const int kInvalidShelfID = 0;
+const int kTimeToSwitchBackgroundMs = 1000;
+
+}  // namespace ash