cc: Handle GrContext::wrapBackendTexture failures properly.

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 <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 1107 matching lines @@
 
     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 = resource_->gl_id;
     skia::RefPtr<GrTexture> gr_texture =
         skia::AdoptRef(gr_context->wrapBackendTexture(desc));
+    if (!gr_texture)
+      return nullptr;
     SkSurface::TextRenderMode text_render_mode =
         use_distance_field_text ? SkSurface::kDistanceField_TextRenderMode
                                 : SkSurface::kStandard_TextRenderMode;
     resource_->sk_surface = skia::AdoptRef(SkSurface::NewRenderTargetDirect(
         gr_texture->asRenderTarget(), text_render_mode));
   }
   return resource_->sk_surface.get();
 }
 
 ResourceProvider::SynchronousFence::SynchronousFence(
@@ skipping 984 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 class GrContext* ResourceProvider::GrContext() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc