Use SkImageCacherator in SkImages

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapCache.h"
 #include "SkImage_Gpu.h"
 #include "GrContext.h"
@@ skipping 61 matching lines @@
                               dst->getPixels(), dst->rowBytes())) {
         return false;
     }
 
     dst->pixelRef()->setImmutableWithID(this->uniqueID());
     SkBitmapCache::Add(this->uniqueID(), *dst);
     fAddedRasterVersionToCache.store(true);
     return true;
 }
 
+GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, SkImageUsageType usage) const {
+    fTexture->ref();
+    return fTexture;
+}
+
 bool SkImage_Gpu::isOpaque() const {
     return GrPixelConfigIsOpaque(fTexture->config()) || fAlphaType == kOpaque_SkAlphaType;
 }
 
 static void apply_premul(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     switch (info.colorType()) {
         case kRGBA_8888_SkColorType:
         case kBGRA_8888_SkColorType:
             break;
         default:
@@ skipping 180 matching lines @@
     if (!dst) {
         return NULL;
     }
     
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP, GrContext::kFlushWrites_PixelOp);
     return dst;
 }