Add DriverBugWorkaroundsInGpuProcessPage to gpu_process_test.py

content/renderer/gpu/gpu_benchmarking_extension.h

Index: content/renderer/gpu/gpu_benchmarking_extension.h
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.h b/content/renderer/gpu/gpu_benchmarking_extension.h
index 3728fed5074d4e7e7767e79ee45ee575b1396c6e..b77aa5af160d7e477047621a819148bcc5c2660f 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.h
+++ b/content/renderer/gpu/gpu_benchmarking_extension.h
@@ -56,6 +56,7 @@ class GpuBenchmarking : public gin::Wrappable<GpuBenchmarking> {
   bool SendMessageToMicroBenchmark(int id, v8::Local<v8::Object> message);
   bool HasGpuChannel();
   bool HasGpuProcess();
+  void GetGpuDriverBugWorkarounds(gin::Arguments* args);
 
   DISALLOW_COPY_AND_ASSIGN(GpuBenchmarking);
 };