Add SkCachedData and use it for SkMipMap

src/core/SkBitmapCache.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapCache_DEFINED
 #define SkBitmapCache_DEFINED
 
@@ skipping 34 matching lines @@
     /**
      * The width and the height of the provided subset must be the same as the result bitmap ones.
      * result must be marked isImmutable()
      */
     static bool Add(uint32_t genID, const SkIRect& subset, const SkBitmap& result,
                     SkResourceCache* localCache = NULL);
 };
 
 class SkMipMapCache {
 public:
-    static const SkMipMap* FindAndRef(const SkBitmap& src);
-    static void Add(const SkBitmap& src, const SkMipMap* result);
+    static const SkMipMap* FindAndRef(const SkBitmap& src, SkResourceCache* localCache = NULL);
+    static const SkMipMap* AddAndRef(const SkBitmap& src, SkResourceCache* localCache = NULL);
 };
 
 #endif