Use GVR async reprojection video surface for fullscreen in VR shell

chrome/browser/android/vr_shell/vr_shell.cc

Index: chrome/browser/android/vr_shell/vr_shell.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell.cc b/chrome/browser/android/vr_shell/vr_shell.cc
index ccff37fc607841bfdc5032bd1adea5edfd7be7b4..dc377441b7a4f1ee0625c52ca1620161751f21e3 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/android/vr_shell/vr_shell_gl.h"
 #include "chrome/browser/android/vr_shell/vr_usage_monitor.h"
 #include "chrome/browser/android/vr_shell/vr_web_contents_observer.h"
+#include "content/public/browser/android/video_surface_manager.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
@@ -150,9 +151,13 @@ VrShell::VrShell(JNIEnv* env,
       main_contents, html_interface_.get(), this));
 
   SetShowingOverscrollGlow(false);
+  content::VideoSurfaceManager::GetInstance()->
+      SetOverrideVideoSurfaceProvider(this);
 }
 
 void VrShell::Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj) {
+  content::VideoSurfaceManager::GetInstance()->
+      RemoveOverrideVideoSurfaceProvider(this);
   delete this;
 }
 
@@ -463,6 +468,25 @@ void VrShell::SetUiCssSize(float width, float height, float dpr) {
   Java_VrShellImpl_setUiCssSize(env, j_vr_shell_.obj(), width, height, dpr);
 }
 
+void VrShell::OnVideoSizeChanged(int width, int height) {
+  // TODO(amp): Do something intelligent with the size.
+}
+
+void VrShell::CreateVideoSurface(content::VideoSurfaceProvider::Client* client,
+                                 const gfx::Size& video_natural_size) {
+  client_ = client;
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_VrShellImpl_createVideoSurface(env, j_vr_shell_.obj());
+  // TODO(amp): Use the natural size somehow.
+}
+
+void VrShell::SetVideoSurface(JNIEnv*,
+                                   const JavaParamRef<jobject>&,
+                                   const JavaParamRef<jobject>& surface) {
+  client_->SetVideoSurface(
+      gl::ScopedJavaSurface::AcquireExternalSurface(surface));
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------