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..71e02313eb23bc7470b656b05b410432f7f84e4e 100644
--- a/device/vr/android/gvr/gvr_device.cc
+++ b/device/vr/android/gvr/gvr_device.cc
@@ -17,6 +17,8 @@
 #include "ui/gfx/transform.h"
 #include "ui/gfx/transform_util.h"
 
+#include "gpu/command_buffer/common/mailbox.h"
+
 namespace device {
 
 GvrDevice::GvrDevice(GvrDeviceProvider* provider)
@@ -58,8 +60,11 @@ void GvrDevice::ExitPresent() {
 
 void GvrDevice::SubmitFrame(mojom::VRPosePtr pose) {
   GvrDelegate* delegate = GetGvrDelegate();
-  if (delegate)
-    delegate->SubmitWebVRFrame();
+  if (delegate) {
+    gpu::Mailbox mailbox;
+    mailbox.SetName(&pose->mailbox->name[0]);
+    delegate->SubmitWebVRFrame(pose->frameId, mailbox);
+  }
 }
 
 void GvrDevice::UpdateLayerBounds(int16_t frame_index,