Enable gpu rasterization in the vr shell

chrome/browser/android/vr_shell/ui_scene.h

Index: chrome/browser/android/vr_shell/ui_scene.h
diff --git a/chrome/browser/android/vr_shell/ui_scene.h b/chrome/browser/android/vr_shell/ui_scene.h
index 62fa01ad2dee383dff1124891d8d9ab76d3e4910..9976c8a97322e1af09a4ee57b8040ddbca306ab5 100644
--- a/chrome/browser/android/vr_shell/ui_scene.h
+++ b/chrome/browser/android/vr_shell/ui_scene.h
@@ -21,6 +21,7 @@ namespace vr_shell {
 
 class Animation;
 class UiElement;
+class VrSurfaceProvider;
 
 class UiScene {
  public:
@@ -71,7 +72,7 @@ class UiScene {
   bool GetWebVrRenderingEnabled() const;
   void SetWebVrRenderingEnabled(bool enabled);
 
-  void OnGLInitialized();
+  void OnGLInitialized(VrSurfaceProvider*);
 
  private:
   void ApplyRecursiveTransforms(UiElement* element);
@@ -82,6 +83,7 @@ class UiScene {
   float background_distance_ = 10.0f;
   bool webvr_rendering_enabled_ = true;
   bool gl_initialized_ = false;
+  VrSurfaceProvider* surface_provider_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(UiScene);
 };