Enable gpu rasterization in the vr shell

chrome/browser/android/vr_shell/vr_shell_gl.cc

Index: chrome/browser/android/vr_shell/vr_shell_gl.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.cc b/chrome/browser/android/vr_shell/vr_shell_gl.cc
index 9bdba4cc81b428493a4b91e82a4fe2ad1be76bba..3ae5a061ed8916aee08b28751f178c0955f02277 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.cc
@@ -30,6 +30,10 @@
 #include "device/vr/vr_math.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "third_party/WebKit/public/platform/WebMouseEvent.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "third_party/skia/include/gpu/GrContextOptions.h"
+#include "third_party/skia/include/gpu/GrTypes.h"
+#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 #include "ui/gl/android/scoped_java_surface.h"
 #include "ui/gl/android/surface_texture.h"
 #include "ui/gl/gl_bindings.h"
@@ -263,6 +267,12 @@ void VrShellGl::InitializeGl(gfx::AcceleratedWidget window) {
     return;
   }
 
+  GrContextOptions gr_context_options;
+  gr_interface_ = GrGLCreateNativeInterface();
+  DCHECK_NE(nullptr, gr_interface_);
+  gr_context_ = GrContext::Create(
+      kOpenGL_GrBackend, (GrBackendContext)gr_interface_, gr_context_options);
+
   unsigned int textures[2];
   glGenTextures(2, textures);
   content_texture_id_ = textures[0];
@@ -279,7 +289,7 @@ void VrShellGl::InitializeGl(gfx::AcceleratedWidget window) {
 
   InitializeRenderer();
 
-  scene_->OnGLInitialized();
+  scene_->OnGLInitialized(this);
 
   gfx::Size webvr_size =
       device::GvrDelegate::GetRecommendedWebVrSize(gvr_api_.get());
@@ -1311,6 +1321,12 @@ void VrShellGl::UpdateVSyncInterval(int64_t timebase_nanos,
   OnVSync();
 }
 
+sk_sp<SkSurface> VrShellGl::MakeSurface(int width, int height) {
+  return SkSurface::MakeRenderTarget(gr_context_, SkBudgeted::kNo,
+                                     SkImageInfo::MakeN32Premul(width, height),
+                                     0, kTopLeft_GrSurfaceOrigin, nullptr);
+}
+
 void VrShellGl::ForceExitVr() {
   browser_->ForceExitVr();
 }