Enable gpu rasterization in the vr shell

chrome/browser/android/vr_shell/vr_shell_gl.h

Index: chrome/browser/android/vr_shell/vr_shell_gl.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.h b/chrome/browser/android/vr_shell/vr_shell_gl.h
index df5d8a107200cfd8e30923f76fd5926eb73e24c3..a615f1bf6522affdfa473289e92bd498e2b37dfa 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.h
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.h
@@ -16,6 +16,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "chrome/browser/android/vr_shell/vr_controller_model.h"
+#include "chrome/browser/android/vr_shell/vr_surface_provider.h"
 #include "device/vr/vr_service.mojom.h"
 #include "device/vr/vr_types.h"
 #include "mojo/public/cpp/bindings/binding.h"
@@ -23,6 +24,9 @@
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.h"
 #include "ui/gfx/native_widget_types.h"
 
+class GrContext;
+struct GrGLInterface;
+
 namespace blink {
 class WebInputEvent;
 }
@@ -61,7 +65,8 @@ struct WebVrBounds {
 
 // This class manages all GLThread owned objects and GL rendering for VrShell.
 // It is not threadsafe and must only be used on the GL thread.
-class VrShellGl : public device::mojom::VRVSyncProvider {
+class VrShellGl : public device::mojom::VRVSyncProvider,
+                  public VrSurfaceProvider {
  public:
   enum class InputTarget {
     NONE = 0,
@@ -151,6 +156,9 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
   // VRVSyncProvider
   void GetVSync(const GetVSyncCallback& callback) override;
 
+  // VrSurfaceProvider
+  sk_sp<SkSurface> MakeSurface(int width, int height) override;
+
   void ForceExitVr();
 
   void SendVSync(base::TimeDelta time, const GetVSyncCallback& callback);
@@ -165,6 +173,9 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
   scoped_refptr<gl::SurfaceTexture> content_surface_texture_;
   scoped_refptr<gl::SurfaceTexture> webvr_surface_texture_;
 
+  GrContext* gr_context_ = nullptr;
+  const GrGLInterface* gr_interface_ = nullptr;
+
   std::unique_ptr<gl::ScopedJavaSurface> content_surface_;
 
   std::unique_ptr<gvr::GvrApi> gvr_api_;