[WebXR] Update using XREye instead of VREye

As following the spec[1] at XRView, The eye has changed to use XREye
instead of VREye. And it is nullable.

[1] : https://immersive-web.github.io/webxr/#xrview-interface

Bug: None
Cq-Include-Trybots: luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib8e698f714ea107bc0ac9a275a6466d419a067e3
Reviewed-on: https://chromium-review.googlesource.com/1180629Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Byoungkwon Ko <codeimpl@gmail.com>
Cr-Commit-Position: refs/heads/master@{#584656}

third_party/blink/renderer/modules/xr/xr_view.cc

@@ -10,7 +10,7 @@
 
 namespace blink {
 
-XRView::XRView(XRSession* session, Eye eye)
+XRView::XRView(XRSession* session, XREye eye)
     : eye_(eye),
       session_(session),
       projection_matrix_(DOMFloat32Array::Create(16)) {

third_party/blink/renderer/modules/xr/xr_view.h

@@ -21,12 +21,12 @@ class XRView final : public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
-  enum Eye { kEyeLeft = 0, kEyeRight = 1 };
+  enum XREye { kEyeLeft = 0, kEyeRight = 1 };
 
-  XRView(XRSession*, Eye);
+  XRView(XRSession*, XREye);
 
   const String& eye() const { return eye_string_; }
-  Eye EyeValue() const { return eye_; }
+  XREye EyeValue() const { return eye_; }
 
   XRSession* session() const;
   DOMFloat32Array* projectionMatrix() const { return projection_matrix_; }
@@ -60,7 +60,7 @@ class XRView final : public ScriptWrappable {
   void Trace(blink::Visitor*) override;
 
  private:
-  const Eye eye_;
+  const XREye eye_;
   String eye_string_;
   Member<XRSession> session_;
   Member<DOMFloat32Array> projection_matrix_;

third_party/blink/renderer/modules/xr/xr_view.idl

@@ -3,11 +3,16 @@
 // found in the LICENSE file.
 
 // https://immersive-web.github.io/webxr/#xrview-interface
+enum XREye {
+  "left",
+  "right"
+};
+
 [
     SecureContext,
     Exposed=Window,
     OriginTrialEnabled=WebXR
 ] interface XRView {
-  readonly attribute VREye? eye;
+  readonly attribute XREye eye;
   readonly attribute Float32Array projectionMatrix;
 };

third_party/blink/renderer/modules/xr/xr_webgl_layer.cc

@@ -157,7 +157,7 @@ XRViewport* XRWebGLLayer::getViewport(XRView* view) {
   return GetViewportForEye(view->EyeValue());
 }
 
-XRViewport* XRWebGLLayer::GetViewportForEye(XRView::Eye eye) {
+XRViewport* XRWebGLLayer::GetViewportForEye(XRView::XREye eye) {
   if (viewports_dirty_)
     UpdateViewports();
 

third_party/blink/renderer/modules/xr/xr_webgl_layer.h

@@ -62,7 +62,7 @@ class XRWebGLLayer final : public XRLayer,
 
   static double getNativeFramebufferScaleFactor(XRSession* session);
 
-  XRViewport* GetViewportForEye(XRView::Eye);
+  XRViewport* GetViewportForEye(XRView::XREye);
 
   void UpdateViewports();