Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

components/view_manager/gles2/command_buffer_local.cc

 // Copyright 2015 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 "components/view_manager/gles2/command_buffer_local.h"
 
 #include "base/bind.h"
 #include "components/view_manager/gles2/command_buffer_local_client.h"
 #include "components/view_manager/gles2/gpu_memory_tracker.h"
 #include "components/view_manager/gles2/mojo_gpu_memory_buffer.h"
@@ skipping 58 matching lines @@
 
   if (!context_->MakeCurrent(surface_.get()))
     return false;
 
   // TODO(piman): ShaderTranslatorCache is currently per-ContextGroup but
   // only needs to be per-thread.
   bool bind_generates_resource = false;
   scoped_refptr<gpu::gles2::ContextGroup> context_group =
       new gpu::gles2::ContextGroup(
           gpu_state_->mailbox_manager(), new gles2::GpuMemoryTracker,
-          new gpu::gles2::ShaderTranslatorCache, nullptr, nullptr, nullptr,
-          bind_generates_resource);
+          new gpu::gles2::ShaderTranslatorCache,
+          new gpu::gles2::FramebufferCompletenessCache, nullptr, nullptr,
+          nullptr, bind_generates_resource);
 
   command_buffer_.reset(
       new gpu::CommandBufferService(context_group->transfer_buffer_manager()));
   bool result = command_buffer_->Initialize();
   DCHECK(result);
 
   decoder_.reset(::gpu::gles2::GLES2Decoder::Create(context_group.get()));
   scheduler_.reset(new gpu::GpuScheduler(command_buffer_.get(), decoder_.get(),
                                          decoder_.get()));
   decoder_->set_engine(scheduler_.get());
@@ skipping 164 matching lines @@
 void CommandBufferLocal::OnContextLost(uint32_t reason) {
   if (client_)
     client_->DidLoseContext();
 }
 
 void CommandBufferLocal::OnSyncPointRetired() {
   scheduler_->SetScheduled(true);
 }
 
 }  // namespace gles2