ContextProvider in OutputSurface

cc/test/layer_tree_test.cc

 // Copyright 2011 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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 598 matching lines @@
     output_surface = FakeOutputSurface::Create3d();
   output_surface_ = output_surface.get();
   return output_surface.PassAs<OutputSurface>();
 }
 
 scoped_refptr<cc::ContextProvider> LayerTreeTest::
     OffscreenContextProviderForMainThread() {
   if (!main_thread_contexts_.get() ||
       main_thread_contexts_->DestroyedOnMainThread()) {
     main_thread_contexts_ = TestContextProvider::Create();
-    if (!main_thread_contexts_->BindToCurrentThread())
+    if (main_thread_contexts_ && !main_thread_contexts_->BindToCurrentThread())
       main_thread_contexts_ = NULL;
   }
   return main_thread_contexts_;
 }
 
 scoped_refptr<cc::ContextProvider> LayerTreeTest::
     OffscreenContextProviderForCompositorThread() {
   if (!compositor_thread_contexts_.get() ||
       compositor_thread_contexts_->DestroyedOnMainThread())
     compositor_thread_contexts_ = TestContextProvider::Create();
   return compositor_thread_contexts_;
 }
 
 }  // namespace cc