cc: Stop creating FBO for read lock on SkImage in Resource Provider

cc/resources/resource_provider.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/resource_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1209 matching lines @@
 ResourceProvider::ScopedReadLockSkImage::ScopedReadLockSkImage(
     ResourceProvider* resource_provider,
     ResourceId resource_id)
     : resource_provider_(resource_provider), resource_id_(resource_id) {
   const Resource* resource = resource_provider->LockForRead(resource_id);
   if (resource->gl_id) {
     GrGLTextureInfo texture_info;
     texture_info.fID = resource->gl_id;
     texture_info.fTarget = resource->target;
     GrBackendTextureDesc desc;
-    desc.fFlags = kRenderTarget_GrBackendTextureFlag;
     desc.fWidth = resource->size.width();
     desc.fHeight = resource->size.height();
     desc.fConfig = ToGrPixelConfig(resource->format);
     desc.fOrigin = kTopLeft_GrSurfaceOrigin;
     desc.fTextureHandle = skia::GrGLTextureInfoToGrBackendObject(texture_info);
     sk_image_ = SkImage::MakeFromTexture(
         resource_provider->compositor_context_provider_->GrContext(), desc,
         kPremul_SkAlphaType,
         resource_provider->GetResourceSkColorSpace(resource), nullptr, nullptr);
   } else if (resource->pixels) {
@@ skipping 818 matching lines @@
 
     const int kImportance = 2;
     pmd->CreateSharedGlobalAllocatorDump(guid);
     pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
   }
 
   return true;
 }
 
 }  // namespace cc