Fix DCHECK(gr_texture) when running test_sky

mojo/skia/ganesh_surface.cc

 // Copyright 2014 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 "mojo/skia/ganesh_surface.h"
 
 namespace mojo {
 
 GaneshSurface::GaneshSurface(GaneshContext* context,
                              scoped_ptr<GLTexture> texture)
     : texture_(texture.Pass()) {
   GrBackendTextureDesc desc;
   desc.fFlags = kRenderTarget_GrBackendTextureFlag;
   desc.fWidth = texture_->size().width;
   desc.fHeight = texture_->size().height;
   desc.fConfig = kSkia8888_GrPixelConfig;
   desc.fOrigin = kTopLeft_GrSurfaceOrigin;
   desc.fTextureHandle = texture_->texture_id();
+  DCHECK(texture_->texture_id());
 
   auto gr_texture = skia::AdoptRef(context->gr()->wrapBackendTexture(desc));
   DCHECK(gr_texture);
   surface_ = skia::AdoptRef(
       SkSurface::NewRenderTargetDirect(gr_texture->asRenderTarget()));
   DCHECK(surface_);
 }
 
 GaneshSurface::~GaneshSurface() {
 }
 
 scoped_ptr<GLTexture> GaneshSurface::TakeTexture() {
   surface_.clear();
   return texture_.Pass();
 }
 
 }  // namespace mojo