cc: Add null checks for GrContext created by ContextProviderCommandBuffer.

cc/test/fake_output_surface.h

 // 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.
 
 #ifndef CC_TEST_FAKE_OUTPUT_SURFACE_H_
 #define CC_TEST_FAKE_OUTPUT_SURFACE_H_
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/time/time.h"
@@ skipping 11 matching lines @@
  public:
   ~FakeOutputSurface() override;
 
   static scoped_ptr<FakeOutputSurface> Create3d() {
     return make_scoped_ptr(new FakeOutputSurface(
         TestContextProvider::Create(), TestContextProvider::Create(), false));
   }
 
   static scoped_ptr<FakeOutputSurface> Create3d(
       scoped_refptr<ContextProvider> context_provider) {
-    return make_scoped_ptr(new FakeOutputSurface(context_provider, false));
+    return make_scoped_ptr(new FakeOutputSurface(
+        context_provider, TestContextProvider::Create(), false));
   }
 
   static scoped_ptr<FakeOutputSurface> Create3d(
       scoped_refptr<ContextProvider> context_provider,
       scoped_refptr<ContextProvider> worker_context_provider) {
     return make_scoped_ptr(new FakeOutputSurface(
         context_provider, worker_context_provider, false));
   }
 
   static scoped_ptr<FakeOutputSurface> Create3d(
       scoped_ptr<TestWebGraphicsContext3D> context) {
-    return make_scoped_ptr(new FakeOutputSurface(
-        TestContextProvider::Create(context.Pass()), false));
+    return make_scoped_ptr(
+        new FakeOutputSurface(TestContextProvider::Create(context.Pass()),
+                              TestContextProvider::Create(), false));
   }
 
   static scoped_ptr<FakeOutputSurface> CreateSoftware(
       scoped_ptr<SoftwareOutputDevice> software_device) {
     return make_scoped_ptr(new FakeOutputSurface(software_device.Pass(),
                                                  false));
   }
 
   static scoped_ptr<FakeOutputSurface> CreateDelegating3d() {
     return make_scoped_ptr(new FakeOutputSurface(
@@ skipping 93 matching lines @@
   bool has_external_stencil_test_;
   unsigned framebuffer_;
   TransferableResourceArray resources_held_by_parent_;
   scoped_ptr<ManagedMemoryPolicy> memory_policy_to_set_at_bind_;
   gfx::Rect last_swap_rect_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_OUTPUT_SURFACE_H_