[WebXR] Change from XRPresentationFrame to XRFrame

XRFrame is a more generric name because with the addition of the input API
we're using frames in places where there's no expectation of rendering or
presentation involved[1].

[1] immersive-web/webxr#364

Bug: 852528
Change-Id: Ie9a325cd626912b09bb2b77fe1b46d29baaef0b8
Reviewed-on: https://chromium-review.googlesource.com/1103426
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568654}

interfaces/webxr.idl

@@ -47,9 +47,9 @@ dictionary XRSessionCreationOptions {
   attribute EventHandler onend;
 };
 
-callback XRFrameRequestCallback = void (DOMHighResTimeStamp time, XRPresentationFrame frame);
+callback XRFrameRequestCallback = void (DOMHighResTimeStamp time, XRFrame frame);
 
-[SecureContext, Exposed=Window] interface XRPresentationFrame {
+[SecureContext, Exposed=Window] interface XRFrame {
   readonly attribute FrozenArray<XRView> views;
 
   XRDevicePose? getDevicePose(XRCoordinateSystem coordinateSystem);

webxr/resources/webxr_util.js

@@ -12,7 +12,7 @@ function forEachWebxrObject(callback) {
   callback(window.XRSessionCreationOptions, 'XRSessionCreationOptions');
   callback(window.XRFrameRequestCallback, 'XRFrameRequestCallback');
   callback(window.XRPresentationContext, 'XRPresentationContext');
-  callback(window.XRPresentationFrame, 'XRPresentationFrame');
+  callback(window.XRFrame, 'XRFrame');
   callback(window.XRView, 'XRView');
   callback(window.XRViewport, 'XRViewport');
   callback(window.XRDevicePose, 'XRDevicePose');