WebVR compositor bypass via BrowserMain context + mailbox

chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc

Index: chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
diff --git a/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc b/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
index c25da54458e04fc8f1922be5bb5c9247182402dd..0dfdab4c50cf9b49ddb941cd27da174551b205e2 100644
--- a/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
+++ b/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
@@ -27,6 +27,14 @@ NonPresentingGvrDelegate::~NonPresentingGvrDelegate() {
   StopVSyncLoop();
 }
 
+void NonPresentingGvrDelegate::SubmitWebVRFrame(
+    int16_t frame_index,
+    const gpu::MailboxHolder& mailbox,
+    device::mojom::VRSubmitFrameClientPtr submit_client) {
+  submit_client->OnSubmitFrameTransferred();
+  submit_client->OnSubmitFrameRendered();
+}
+
 void NonPresentingGvrDelegate::OnVRVsyncProviderRequest(
     device::mojom::VRVSyncProviderRequest request) {
   binding_.Close();