Add WebVR WebVR E2E test capabilities via Android instrumentation

chrome/test/data/android/webvr_instrumentation/resources/webvr_boilerplate.js

+// Copyright 2017 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.
+
+var webglCanvas = document.getElementById("webgl-canvas");
+var glAttribs = {
+  alpha: false,
+};
+var gl = webglCanvas.getContext("webgl", glAttribs);
+var vrDisplay = null;
+var frameData = null;
+
+function onResize() {
+  if (vrDisplay && vrDisplay.isPresenting) {
+    var leftEye = vrDisplay.getEyeParameters("left");
+    var rightEye = vrDisplay.getEyeParameters("right");
+
+    webglCanvas.width = Math.max(leftEye.renderWidth, rightEye.renderWidth) * 2;
+    webglCanvas.height = Math.max(leftEye.renderHeight, rightEye.renderHeight);
+  } else {
+    webglCanvas.width = webglCanvas.offsetWidth * window.devicePixelRatio;
+    webglCanvas.height = webglCanvas.offsetHeight * window.devicePixelRatio;
+  }
+}
+
+function onVrPresentChange() {
+  onResize();
+}
+
+function onVrRequestPresent() {
+  vrDisplay.requestPresent([{source: webglCanvas}]);
+}
+
+function onAnimationFrame(t) {
+  if (vrDisplay == null) {
+    window.requestAnimationFrame(onAnimationFrame);
+    gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
+    return;
+  }
+  vrDisplay.requestAnimationFrame(onAnimationFrame);
+  // If presenting, set canvas to blue. Otherwise, red.
+  if (vrDisplay.isPresenting) {
+    vrDisplay.getFrameData(frameData);
+
+    gl.clearColor(0.0, 0.0, 1.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+    gl.viewport(0, 0, webglCanvas.width * 0.5, webglCanvas.height);
+    gl.viewport(webglCanvas.width * 0.5, 0, webglCanvas.width * 0.5,
+                webglCanvas.height);
+
+    vrDisplay.submitFrame();
+  } else {
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+    gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
+  }
+}
+
+if (navigator.getVRDisplays) {
+  frameData = new VRFrameData();
+  navigator.getVRDisplays().then( (displays) => {
+    if (displays.length > 0) {
+      vrDisplay = displays[0];
+    }
+  }).then( () => {
+    vrDisplayPromiseDone = true;
+  });
+}
+
+gl.clearColor(1.0, 0.0, 0.0, 1.0);
+gl.enable(gl.DEPTH_TEST);
+gl.enable(gl.CULL_FACE);
+window.addEventListener("resize", onResize, false);
+window.addEventListener("vrdisplaypresentchange", onVrPresentChange, false);
+window.addEventListener('vrdisplayactivate', onVrRequestPresent, false);
+window.requestAnimationFrame(onAnimationFrame);
+webglCanvas.onclick = onVrRequestPresent;
+onResize();