Update test processing of StageParameters changes

Currently the test code only sends the stage parameters as Display Info
updates. Now that WebVr has been removed, this code path is one that is
being considered for removal.

The real runtimes utilize both this VRDisplayInfo update path as well as
updating the stage parameters with frame data.

This changes the test runtime to do the same (i.e. send up stage
parameters via both DisplayInfo and FrameData).

Fixed: 983363
Change-Id: I3c0a3f59b97163c3ac3b8f4b6529183142688d0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056501
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741671}

resources/chromium/webxr-test.js

@@ -226,6 +226,8 @@ class MockRuntime {
     this.next_frame_id_ = 0;
     this.bounds_ = null;
     this.send_mojo_space_reset_ = false;
+    this.stageParameters_ = null;
+    this.stageParametersUpdated_ = false;
 
     this.service_ = service;
 
@@ -387,37 +389,38 @@ class MockRuntime {
     // don't know the transform from local space to bounds space.
     // We'll cache the bounds so that they can be set in the future if the
     // floorLevel transform is set, but we won't update them just yet.
-    if (this.displayInfo_.stageParameters) {
-      this.displayInfo_.stageParameters.bounds = this.bounds_;
-
-      if (this.sessionClient_.ptr.isBound()) {
-        this.sessionClient_.onChanged(this.displayInfo_);
-      }
+    if (this.stageParameters_) {
+      this.stageParameters_.bounds = this.bounds_;
+      this.onStageParametersUpdated();
     }
   }
 
   setFloorOrigin(floorOrigin) {
-    if (!this.displayInfo_.stageParameters) {
-      this.displayInfo_.stageParameters = default_stage_parameters;
-      this.displayInfo_.stageParameters.bounds = this.bounds_;
+    if (!this.stageParameters_) {
+      this.stageParameters_ = default_stage_parameters;
+      this.stageParameters_.bounds = this.bounds_;
     }
 
-    this.displayInfo_.stageParameters.standingTransform = new gfx.mojom.Transform();
-    this.displayInfo_.stageParameters.standingTransform.matrix =
+    this.stageParameters_.standingTransform = new gfx.mojom.Transform();
+    this.stageParameters_.standingTransform.matrix =
       getMatrixFromTransform(floorOrigin);
 
-    if (this.sessionClient_.ptr.isBound()) {
-      this.sessionClient_.onChanged(this.displayInfo_);
-    }
+    this.onStageParametersUpdated();
   }
 
   clearFloorOrigin() {
-    if (this.displayInfo_.stageParameters) {
-      this.displayInfo_.stageParameters = null;
+    if (this.stageParameters_) {
+      this.stageParameters_ = null;
+      this.onStageParametersUpdated();
+    }
+  }
 
-      if (this.sessionClient_.ptr.isBound()) {
-        this.sessionClient_.onChanged(this.displayInfo_);
-      }
+  onStageParametersUpdated() {
+    // Indicate for the frame loop that the stage parameters have been updated.
+    this.stageParametersUpdated_ = true;
+    this.displayInfo_.stageParameters = this.stageParameters_;
+    if (this.sessionClient_.ptr.isBound()) {
+      this.sessionClient_.onChanged(this.displayInfo_);
     }
   }
 
@@ -569,6 +572,9 @@ class MockRuntime {
   getFrameData(options) {
     const mojo_space_reset = this.send_mojo_space_reset_;
     this.send_mojo_space_reset_ = false;
+
+    const stage_parameters_updated = this.stageParametersUpdated_;
+    this.stageParametersUpdated_ = false;
     if (this.pose_) {
       this.pose_.poseIndex++;
     }
@@ -601,6 +607,8 @@ class MockRuntime {
       frameId: this.next_frame_id_++,
       bufferHolder: null,
       bufferSize: {},
+      stageParameters: this.stageParameters_,
+      stageParametersUpdated: stage_parameters_updated,
     };
 
     this._calculateHitTestResults(frameData);
@@ -946,13 +954,12 @@ class MockRuntime {
         case device.mojom.XRReferenceSpaceCategory.LOCAL:
           return identity();
         case device.mojom.XRReferenceSpaceCategory.LOCAL_FLOOR:
-          if (this.displayInfo_ == null || this.displayInfo_.stageParameters == null
-           || this.displayInfo_.stageParameters.standingTransform == null) {
+          if (this.stageParameters_ == null || this.stageParameters_.standingTransform == null) {
             console.warn("Standing transform not available.");
             return null;
           }
-          // this.displayInfo_.stageParameters.standingTransform = floor_from_mojo aka native_origin_from_mojo
-          return XRMathHelper.inverse(this.displayInfo_.stageParameters.standingTransform.matrix);
+          // this.stageParameters_.standingTransform = floor_from_mojo aka native_origin_from_mojo
+          return XRMathHelper.inverse(this.stageParameters_.standingTransform.matrix);
         case device.mojom.XRReferenceSpaceCategory.VIEWER:
           const transform = {
             position: [