Re-land^2 WebVR compositor bypass via BrowserMain context + mailbox

device/vr/android/gvr/gvr_device.cc

Index: device/vr/android/gvr/gvr_device.cc
diff --git a/device/vr/android/gvr/gvr_device.cc b/device/vr/android/gvr/gvr_device.cc
index f0a86e2fd9a94fb14ecff45c05a1d120fa63521a..fe1123b040f2984e5da85fb2d8bb78079c2bcde1 100644
--- a/device/vr/android/gvr/gvr_device.cc
+++ b/device/vr/android/gvr/gvr_device.cc
@@ -12,6 +12,7 @@
 #include "device/vr/android/gvr/gvr_delegate.h"
 #include "device/vr/android/gvr/gvr_device_provider.h"
 #include "device/vr/vr_device_manager.h"
+#include "gpu/command_buffer/common/mailbox.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.h"
 #include "ui/gfx/transform.h"
@@ -56,10 +57,16 @@ void GvrDevice::ExitPresent() {
   OnExitPresent();
 }
 
-void GvrDevice::SubmitFrame(mojom::VRPosePtr pose) {
+void GvrDevice::SubmitFrame(
+    mojom::VRPosePtr pose,
+    mojom::VRSubmitFrameClientPtr submit_client) {
   GvrDelegate* delegate = GetGvrDelegate();
-  if (delegate)
-    delegate->SubmitWebVRFrame();
+  if (delegate) {
+    gpu::Mailbox mailbox;
+    mailbox.SetName(&pose->mailbox->name[0]);
+    delegate->SubmitWebVRFrame(
+        pose->frameId, mailbox, std::move(submit_client));
+  }
 }
 
 void GvrDevice::UpdateLayerBounds(int16_t frame_index,