Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

gpu/command_buffer/service/in_process_command_buffer.cc

Index: gpu/command_buffer/service/in_process_command_buffer.cc
diff --git a/gpu/command_buffer/service/in_process_command_buffer.cc b/gpu/command_buffer/service/in_process_command_buffer.cc
index f5ad4da1559a54973a38901cf5123fada23516d3..6b072bf540d5c1965c7fbebe58a526cfc96c275b 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.cc
+++ b/gpu/command_buffer/service/in_process_command_buffer.cc
@@ -299,11 +299,10 @@ bool InProcessCommandBuffer::InitializeOnGpuThread(
   decoder_.reset(gles2::GLES2Decoder::Create(
       params.context_group
           ? params.context_group->decoder_->GetContextGroup()
-          : new gles2::ContextGroup(service_->mailbox_manager(),
-                                    NULL,
+          : new gles2::ContextGroup(service_->mailbox_manager(), NULL,
                                     service_->shader_translator_cache(),
-                                    NULL,
-                                    service_->subscription_ref_set(),
+                                    service_->framebuffer_completeness_cache(),
+                                    NULL, service_->subscription_ref_set(),
                                     service_->pending_valuebuffer_state(),
                                     bind_generates_resource)));
 
@@ -925,6 +924,14 @@ GpuInProcessThread::shader_translator_cache() {
   return shader_translator_cache_;
 }
 
+scoped_refptr<gles2::FramebufferCompletenessCache>
+GpuInProcessThread::framebuffer_completeness_cache() {
+  if (!framebuffer_completeness_cache_.get())
+    framebuffer_completeness_cache_ =
+        new gpu::gles2::FramebufferCompletenessCache;
+  return framebuffer_completeness_cache_;
+}
+
 SyncPointManager* GpuInProcessThread::sync_point_manager() {
   return sync_point_manager_;
 }