Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

gpu/command_buffer/service/context_group_unittest.cc

 // Copyright (c) 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 "gpu/command_buffer/service/context_group.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/common/value_state.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_mock.h"
 #include "gpu/command_buffer/service/gpu_service_test.h"
@@ skipping 23 matching lines @@
  public:
   static const bool kBindGeneratesResource = false;
 
   ContextGroupTest() {}
 
  protected:
   void SetUp() override {
     GpuServiceTest::SetUp();
     decoder_.reset(new MockGLES2Decoder());
     group_ = scoped_refptr<ContextGroup>(new ContextGroup(
-        NULL, NULL, NULL, NULL, NULL, NULL, kBindGeneratesResource));
+        NULL, NULL, NULL, NULL, NULL, NULL, NULL, kBindGeneratesResource));
   }
 
   scoped_ptr<MockGLES2Decoder> decoder_;
   scoped_refptr<ContextGroup> group_;
 };
 
 TEST_F(ContextGroupTest, Basic) {
   // Test it starts off uninitialized.
   EXPECT_EQ(0u, group_->max_vertex_attribs());
   EXPECT_EQ(0u, group_->max_texture_units());
@@ skipping 86 matching lines @@
   EXPECT_TRUE(group_->renderbuffer_manager() == NULL);
   EXPECT_TRUE(group_->texture_manager() == NULL);
   EXPECT_TRUE(group_->program_manager() == NULL);
   EXPECT_TRUE(group_->shader_manager() == NULL);
 }
 
 }  // namespace gles2
 }  // namespace gpu