Revert of Compute GpuDriverBugWorkarounds only one time in the GPU process

gpu/ipc/service/gpu_channel.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/ipc/service/gpu_channel.h"
 
 #include <utility>
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 964 matching lines @@
   if (stub && !stub->IsScheduled()) {
     // This stub won't get a chance to reschedule the stream so do that now.
     OnStreamRescheduled(stub->stream_id(), true);
   }
 
   RemoveRoute(route_id);
 }
 
 void GpuChannel::OnGetDriverBugWorkArounds(
     std::vector<std::string>* gpu_driver_bug_workarounds) {
+  // TODO(j.isorce): http://crbug.com/599964 Do the extraction of workarounds in
+  // the GpuChannelManager constructor. Currently it is done in the FeatureInfo
+  // constructor. There is no need to extract them from the command-line every
+  // time a new FeatureInfo is created (i.e. per ContextGroup) since parsing
+  // result is a constant.
+  scoped_refptr<gpu::gles2::FeatureInfo> feature_info =
+      new gpu::gles2::FeatureInfo;
   gpu_driver_bug_workarounds->clear();
-#define GPU_OP(type, name)                                     \
-  if (gpu_channel_manager_->gpu_driver_bug_workarounds().name) \
+#define GPU_OP(type, name)              \
+  if (feature_info->workarounds().name) \
     gpu_driver_bug_workarounds->push_back(#name);
   GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 #undef GPU_OP
 }
 
 void GpuChannel::CacheShader(const std::string& key,
                              const std::string& shader) {
   gpu_channel_manager_->delegate()->StoreShaderToDisk(client_id_, key, shader);
 }
 
@@ skipping 58 matching lines @@
     }
   }
 }
 
 void GpuChannel::HandleUpdateValueState(
     unsigned int target, const ValueState& state) {
   pending_valuebuffer_state_->UpdateState(target, state);
 }
 
 }  // namespace gpu