WIP: working copy-no-compositor path

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 d41b1a9ed09da0fe5157c51d9de5af058d4e1a0d..b4091b32deec6e7d5f1d4ebda87fbf2ad37f4abc 100644
--- a/device/vr/vr_service.mojom
+++ b/device/vr/vr_service.mojom
@@ -15,6 +15,10 @@ struct VRFieldOfView {
 // given timestamp.
 struct VRPose {
   double timestamp;
+  double ts_frameStart;
+  double ts_getPose;
+  double ts_gotPose;
+  double ts_submit;
   array<float, 4>? orientation;
   array<float, 3>? position;
   array<float, 3>? angularVelocity;
@@ -22,7 +26,8 @@ struct VRPose {
   array<float, 3>? angularAcceleration;
   array<float, 3>? linearAcceleration;
   // The poseIndex is a sequential ID that's incremented on each distinct
-  // getPose result, it may wrap around for long sessions.
+  // getPose result, it may wrap around for long sessions. Always positive
+  // and nonzero.
   uint32 poseIndex;
 };
 
@@ -61,6 +66,7 @@ struct VRLayerBounds {
   float top;
   float width;
   float height;
+  uint32 forPoseIndex;
 };
 
 enum VRDisplayEventReason {
@@ -83,15 +89,20 @@ interface VRServiceClient {
   OnDisplayConnected(VRDisplay display, VRDisplayClient& request, VRDisplayInfo displayInfo);
 };
 
+interface VRPoseClient {
+  OnPoseReceived(VRPose? pose);
+};
+
 interface VRDisplay {
-  [Sync]
-  GetPose() => (VRPose? pose);
+  GetPose(VRPoseClient poseClient);
   ResetPose();
 
   RequestPresent(bool secureOrigin) => (bool success);
   ExitPresent();
-  SubmitFrame(VRPose? pose);
+  SubmitFrame(int32 surfaceHandle, VRPose? pose) => (int32 surfaceHandle, uint32 poseIndex, double renderMs);
   UpdateLayerBounds(VRLayerBounds leftBounds, VRLayerBounds rightBounds);
+
+  GetSurfaceHandle(int32 width, int32 height) => (int32 surfaceHandle);
 };
 
 interface VRDisplayClient {