Compute GpuDriverBugWorkarounds only one time in the GPU process

gpu/command_buffer/service/context_group.cc

Index: gpu/command_buffer/service/context_group.cc
diff --git a/gpu/command_buffer/service/context_group.cc b/gpu/command_buffer/service/context_group.cc
index 56f70303af63af2016fb3037a538fbeeea596e6e..001b43c9d4db5e874113a5547e93ed75d3f41d29 100644
--- a/gpu/command_buffer/service/context_group.cc
+++ b/gpu/command_buffer/service/context_group.cc
@@ -104,14 +104,13 @@ ContextGroup::ContextGroup(
       program_cache_(NULL),
       feature_info_(feature_info) {
   {
+    DCHECK(feature_info_);
     if (!mailbox_manager_.get())
       mailbox_manager_ = new MailboxManagerImpl;
     if (!subscription_ref_set_.get())
       subscription_ref_set_ = new SubscriptionRefSet();
     if (!pending_valuebuffer_state_.get())
       pending_valuebuffer_state_ = new ValueStateMap();
-    if (!feature_info.get())
-      feature_info_ = new FeatureInfo;
     transfer_buffer_manager_ = new TransferBufferManager(memory_tracker_.get());
   }
 }