Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

content/common/gpu/gpu_command_buffer_stub.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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/hash.h"
 #include "base/json/json_writer.h"
 #include "base/memory/shared_memory.h"
@@ skipping 191 matching lines @@
 
   gpu::gles2::ContextCreationAttribHelper attrib_parser;
   attrib_parser.Parse(requested_attribs_);
 
   if (share_group) {
     context_group_ = share_group->context_group_;
     DCHECK(context_group_->bind_generates_resource() ==
            attrib_parser.bind_generates_resource);
   } else {
     context_group_ = new gpu::gles2::ContextGroup(
-        mailbox_manager,
-        new GpuCommandBufferMemoryTracker(channel),
+        mailbox_manager, new GpuCommandBufferMemoryTracker(channel),
         channel_->gpu_channel_manager()->shader_translator_cache(),
-        NULL,
-        subscription_ref_set,
-        pending_valuebuffer_state,
+        channel_->gpu_channel_manager()->framebuffer_completeness_cache(), NULL,
+        subscription_ref_set, pending_valuebuffer_state,
         attrib_parser.bind_generates_resource);
   }
 
   use_virtualized_gl_context_ |=
       context_group_->feature_info()->workarounds().use_virtualized_gl_contexts;
 
   bool is_offscreen = surface_id_ == 0;
   if (is_offscreen && initial_size_.IsEmpty()) {
     // If we're an offscreen surface with zero width and/or height, set to a
     // non-zero size so that we have a complete framebuffer for operations like
@@ skipping 944 matching lines @@
                                                     result));
 }
 
 void GpuCommandBufferStub::SendUpdateVSyncParameters(base::TimeTicks timebase,
                                                      base::TimeDelta interval) {
   Send(new GpuCommandBufferMsg_UpdateVSyncParameters(route_id_, timebase,
                                                      interval));
 }
 
 }  // namespace content