skia: Add support for CHROMIUM_image backed textures.

src/gpu/GrTextureProvider.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 "GrTextureProvider.h"
 #include "GrTexturePriv.h"
 #include "GrResourceCache.h"
@@ skipping 21 matching lines @@
 GrTexture* GrTextureProvider::createTexture(const GrSurfaceDesc& desc, bool budgeted,
                                             const void* srcData, size_t rowBytes) {
     ASSERT_SINGLE_OWNER
     if (this->isAbandoned()) {
         return nullptr;
     }
     if ((desc.fFlags & kRenderTarget_GrSurfaceFlag) &&
         !fGpu->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
         return nullptr;
     }
-    if (!GrPixelConfigIsCompressed(desc.fConfig)) {
+    if (!GrPixelConfigIsCompressed(desc.fConfig) &&
+        !desc.fTextureStorageAllocator.fAllocateTextureStorage) {
         static const uint32_t kFlags = kExact_ScratchTextureFlag |
                                        kNoCreate_ScratchTextureFlag;
         if (GrTexture* texture = this->refScratchTexture(desc, kFlags)) {
             if (!srcData || texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
                                                  srcData, rowBytes)) {
                 if (!budgeted) {
                     texture->resourcePriv().makeUnbudgeted();
                 }
                 return texture;
             }
@@ skipping 105 matching lines @@
 GrTexture* GrTextureProvider::findAndRefTextureByUniqueKey(const GrUniqueKey& key) {
     ASSERT_SINGLE_OWNER
     GrGpuResource* resource = this->findAndRefResourceByUniqueKey(key);
     if (resource) {
         GrTexture* texture = static_cast<GrSurface*>(resource)->asTexture();
         SkASSERT(texture);
         return texture;
     }
     return NULL;
 }