mojo VR interface simplified

device/vr/vr_service.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+// Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file.
 
 module device;
 
 // A field of view, given by 4 degrees describing the view from a center point.
 struct VRFieldOfView {
   float upDegrees;
   float downDegrees;
   float leftDegrees;
   float rightDegrees;
 };
@@ skipping 28 matching lines @@
   uint32 renderHeight;
 };
 
 struct VRStageParameters {
   array<float, 16> standingTransform;
   float sizeX;
   float sizeZ;
 };
 
 struct VRDisplay {
-   uint32 index;
    string displayName;
    VRDisplayCapabilities capabilities;
    VRStageParameters? stageParameters;
    VREyeParameters leftEye;
    VREyeParameters rightEye;
 };
 
+struct VRDisplayWithService {
+   VRDisplay? display;
+   VRDeviceClient? service;
+};
+
 struct VRLayerBounds {
    float left;
    float top;
    float width;
    float height;
 };
 
 interface VRService {
+  GetDisplays() => (bool success);
   SetClient(VRServiceClient client);
-
-  GetDisplays() => (array<VRDisplay> displays);
-  [Sync]
-  GetPose(uint32 index) => (VRPose? pose);
-  ResetPose(uint32 index);
-
-  RequestPresent(uint32 index, bool secureOrigin) => (bool success);
-  ExitPresent(uint32 index);
-  SubmitFrame(uint32 index, VRPose? pose);
-  UpdateLayerBounds(uint32 index, VRLayerBounds leftBounds, VRLayerBounds rightBounds);
 };
 
 interface VRServiceClient {
+  [Sync]
+  GetDisplayClient() => (VRDisplayClient? client);
+};
+
+interface VRDeviceClient {

[leonhsl(Using Gerrit), 2016/10/25 03:17:40]

Still old comments about interface naming... : (VRDevice, VRDeviceClient) pair
should have the similar relationship with existing Chromium interface pairs, for
example (VRService, VRServiceClient) pair, but now seems both VRDevice and
VRDeviceClient live in Browser and have no any mojo connection.

+  [Sync]
+  GetPose() => (VRPose? pose);
+  ResetPose();
+
+  RequestPresent(bool secureOrigin) => (bool success);
+  ExitPresent();
+  SubmitFrame(VRPose? pose);
+  UpdateLayerBounds(VRLayerBounds leftBounds, VRLayerBounds rightBounds);
+};
+
+interface VRDisplayClient {
+  RegisterDeviceClient(VRDeviceClient? device_client);
+  UpdateDisplayInfo(VRDisplay display);
+
   OnDisplayChanged(VRDisplay display);
-  OnExitPresent(uint32 index);
+  OnExitPresent();
   OnDisplayConnected(VRDisplay display);
-  OnDisplayDisconnected(uint32 index);
+  OnDisplayDisconnected();
 };