Compute GpuDriverBugWorkarounds only one time in the GPU process

gpu/command_buffer/service/gpu_service_test.h

Index: gpu/command_buffer/service/gpu_service_test.h
diff --git a/gpu/command_buffer/service/gpu_service_test.h b/gpu/command_buffer/service/gpu_service_test.h
index e547ff12fdab3bb3096c5696ebc20f351947cc8e..48a833cf9dfa951507d2b39bfcc77defdcf16b60 100644
--- a/gpu/command_buffer/service/gpu_service_test.h
+++ b/gpu/command_buffer/service/gpu_service_test.h
@@ -8,6 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
+#include "gpu/config/gpu_driver_bug_workarounds.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_mock.h"
@@ -32,6 +33,7 @@ class GpuServiceTest : public testing::Test {
   gfx::GLContext* GetGLContext();
 
   scoped_ptr< ::testing::StrictMock< ::gfx::MockGLInterface> > gl_;
+  GpuDriverBugWorkarounds gpu_driver_bug_workarounds_;
 
  private:
   bool ran_setup_;