Revert of WebVR compositor bypass via BrowserMain context + mailbox

device/vr/vr_service.mojom

Index: device/vr/vr_service.mojom
diff --git a/device/vr/vr_service.mojom b/device/vr/vr_service.mojom
index f85a63bdfac340295ffb929b789dfe0747c63d47..2af38f579633e856444ee7611122b8e7cb1118eb 100644
--- a/device/vr/vr_service.mojom
+++ b/device/vr/vr_service.mojom
@@ -5,8 +5,6 @@
 module device.mojom;
 
 import "mojo/common/time.mojom";
-import "gpu/ipc/common/mailbox_holder.mojom";
-import "gpu/ipc/common/sync_token.mojom";
 
 // A field of view, given by 4 degrees describing the view from a center point.
 struct VRFieldOfView {
@@ -87,25 +85,19 @@
                      VRDisplayInfo displayInfo);
 };
 
-interface VRSubmitFrameClient {
-  OnSubmitFrameTransferred();
-  OnSubmitFrameRendered();
-};
-
 interface VRDisplay {
   ResetPose();
 
-  RequestPresent(bool secureOrigin, VRSubmitFrameClient client) => (bool success);
+  RequestPresent(bool secureOrigin) => (bool success);
   ExitPresent();
-  SubmitFrame(int16 frameId, gpu.mojom.MailboxHolder mailboxHolder);
+  SubmitFrame(VRPose? pose);
   UpdateLayerBounds(int16 frameId, VRLayerBounds leftBounds,
-                    VRLayerBounds rightBounds, int16 sourceWidth,
-                    int16 sourceHeight);
+                    VRLayerBounds rightBounds);
   GetVRVSyncProvider(VRVSyncProvider& request);
 };
 
 interface VRVSyncProvider {
-  enum Status { SUCCESS, CLOSING };
+  enum Status { SUCCESS, RETRY };
 
   // The frameId maps a VSync to a frame arriving from the compositor. IDs will
   // be reused after the frame arrives from the compositor. Negative IDs imply