Purge cached resources on SkImage destruction.

src/core/SkBitmapProvider.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProvider.h"
 #include "SkImage_Base.h"
 #include "SkPixelRef.h"
@@ skipping 44 matching lines @@
 SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc(int w, int h) const {
     return fImage ? SkBitmapCacheDesc::Make(fImage, w, h) : SkBitmapCacheDesc::Make(fBitmap, w, h);
 }
 
 SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc() const {
     return fImage ? SkBitmapCacheDesc::Make(fImage) : SkBitmapCacheDesc::Make(fBitmap);
 }
 
 void SkBitmapProvider::notifyAddedToCache() const {
     if (fImage) {
-        // TODO
+        as_IB(fImage)->notifyAddedToCache();
     } else {
         fBitmap.pixelRef()->notifyAddedToCache();
     }
 }
 
 bool SkBitmapProvider::asBitmap(SkBitmap* bm) const {
     if (fImage) {
         return as_IB(fImage)->getROPixels(bm);
     } else {
         *bm = fBitmap;
         return true;
     }
 }