cc: Adding support for RGBA_4444 tile textures

cc/resources/resource_format.h

+// 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 CC_RESOURCES_RESOURCE_FORMAT_H_
+#define CC_RESOURCES_RESOURCE_FORMAT_H_
+
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace cc {
+
+enum ResourceFormat {
+  RGBA_8888,
+  RGBA_4444,
+  BGRA_8888,
+  LUMINANCE_8,
+  RESOURCE_FORMAT_MAX = LUMINANCE_8,
+};
+
+SkBitmap::Config SkBitmapConfigFromFormat(ResourceFormat format);
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RESOURCE_FORMAT_H_