skia: Add support for CHROMIUM_image backed textures.

src/gpu/GrTextureProvider.cpp

Index: src/gpu/GrTextureProvider.cpp
diff --git a/src/gpu/GrTextureProvider.cpp b/src/gpu/GrTextureProvider.cpp
index 1c2f36535a0166ce143d66ca34936f9874ec1cb8..84226dbf4731f1ec01c5e1938c7a4bfb5f62223c 100644
--- a/src/gpu/GrTextureProvider.cpp
+++ b/src/gpu/GrTextureProvider.cpp
@@ -40,7 +40,8 @@ GrTexture* GrTextureProvider::createTexture(const GrSurfaceDesc& desc, bool budg
         !fGpu->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
         return nullptr;
     }
-    if (!GrPixelConfigIsCompressed(desc.fConfig)) {
+    if (!GrPixelConfigIsCompressed(desc.fConfig) &&
+            !desc.fTextureStorageAllocator.fAllocateTextureStorage) {

[bsalomon, 2016/02/04 16:27:08]

nit, style aligns this ! with the one above (not crazy about it but it is what
do :) )

[erikchen, 2016/02/04 18:44:07]

Done.

         static const uint32_t kFlags = kExact_ScratchTextureFlag |
                                        kNoCreate_ScratchTextureFlag;
         if (GrTexture* texture = this->refScratchTexture(desc, kFlags)) {