Fix UiThreadGpu initialization for video accelerator tests

ui/ozone/public/ui_thread_gpu.h

Index: ui/ozone/public/ui_thread_gpu.h
diff --git a/ui/ozone/public/ui_thread_gpu.h b/ui/ozone/public/ui_thread_gpu.h
index 4e75dabfde462cdc9714e574304b51bae8ce0545..30d5beb4c02fe9452ea562b6929827f7fc9984f7 100644
--- a/ui/ozone/public/ui_thread_gpu.h
+++ b/ui/ozone/public/ui_thread_gpu.h
@@ -5,10 +5,12 @@
 #ifndef UI_OZONE_PUBLIC_UI_THREAD_GPU_H_
 #define UI_OZONE_PUBLIC_UI_THREAD_GPU_H_
 
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/ozone/ozone_export.h"
 
 namespace base {
+class SingleThreadTaskRunner;
 class Thread;
 }
 
@@ -27,7 +29,9 @@ class OZONE_EXPORT UiThreadGpu {
   virtual ~UiThreadGpu();
 
   // Start processing gpu messages.
-  bool Initialize();
+  bool Initialize(
+      const scoped_refptr<base::SingleThreadTaskRunner>& browser_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& gpu_task_runner);
 
  private:
   scoped_ptr<FakeGpuProcess> fake_gpu_process_;