Revert of Import web-platform-tests@5a8700479d98852455bee6117558897867eb278a

third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/testcommon.js

-/*
-Distributed under both the W3C Test Suite License [1] and the W3C
-3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
-policies and contribution forms [3].
-
-[1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
-[2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
-[3] http://www.w3.org/2004/10/27-testcases
- */
-
-"use strict";
-
-var ANIMATION_END_TIME = 1000;
-var ANIMATION_TOP_DEFAULT = 300;
-var ANIMATION_TOP_0 = 10;
-var ANIMATION_TOP_0_5 = 100;
-var ANIMATION_TOP_1 = 200;
-
-var KEYFRAMES = [ {
-  top : ANIMATION_TOP_0 + 'px',
-  offset : 0
-}, {
-  top : ANIMATION_TOP_0_5 + 'px',
-  offset : 1 / 2
-}, {
-  top : ANIMATION_TOP_1 + 'px',
-  offset : 1
-} ];
-
-// creates new animation for given target
-function newAnimation(animationTarget) {
-  animationTarget.style.top = ANIMATION_TOP_DEFAULT + 'px';
-  return new Animation(animationTarget, KEYFRAMES, ANIMATION_END_TIME);
-}
-
-// creates div element, appends it to the document body and
-// removes the created element during test cleanup
-function createDiv(test, doc) {
-  if (!doc) {
-    doc = document;
-  }
-  var div = doc.createElement('div');
-  doc.body.appendChild(div);
-  test.add_cleanup(function() {
-    div.remove();
-  });
-  return div;
-}
-
-// Creates a style element with the specified rules, appends it to the document
-// head and removes the created element during test cleanup.
-// |rules| is an object. For example:
-// { '@keyframes anim': '' ,
-//   '.className': 'animation: anim 100s;' };
-// or
-// { '.className1::before': 'content: ""; width: 0px; transition: all 10s;',
-//   '.className2::before': 'width: 100px;' };
-// The object property name could be a keyframes name, or a selector.
-// The object property value is declarations which are property:value pairs
-// split by a space.
-function createStyle(test, rules, doc) {
-  if (!doc) {
-    doc = document;
-  }
-  var extraStyle = doc.createElement('style');
-  doc.head.appendChild(extraStyle);
-  if (rules) {
-    var sheet = extraStyle.sheet;
-    for (var selector in rules) {
-      sheet.insertRule(selector + '{' + rules[selector] + '}',
-                       sheet.cssRules.length);
-    }
-  }
-  test.add_cleanup(function() {
-    extraStyle.remove();
-  });
-}
-
-// Create a pseudo element
-function createPseudo(test, type) {
-  createStyle(test, { '@keyframes anim': '',
-                      ['.pseudo::' + type]: 'animation: anim 10s;' });
-  var div = createDiv(test);
-  div.classList.add('pseudo');
-  var anims = document.getAnimations();
-  assert_true(anims.length >= 1);
-  var anim = anims[anims.length - 1];
-  assert_equals(anim.effect.target.parentElement, div);
-  assert_equals(anim.effect.target.type, '::' + type);
-  anim.cancel();
-  return anim.effect.target;
-}
-
-// Returns the type name of given object
-function type(object) {
-  return Object.prototype.toString.call(object).slice(8, -1);
-}
-
-// Convert px unit value to a Number
-function pxToNum(str) {
-  return Number(String(str).match(/^(-?[\d.]+)px$/)[1]);
-}
-
-// Cubic bezier with control points (0, 0), (x1, y1), (x2, y2), and (1, 1).
-function cubicBezier(x1, y1, x2, y2) {
-  function xForT(t) {
-    var omt = 1-t;
-    return 3 * omt * omt * t * x1 + 3 * omt * t * t * x2 + t * t * t;
-  }
-
-  function yForT(t) {
-    var omt = 1-t;
-    return 3 * omt * omt * t * y1 + 3 * omt * t * t * y2 + t * t * t;
-  }
-
-  function tForX(x) {
-    // Binary subdivision.
-    var mint = 0, maxt = 1;
-    for (var i = 0; i < 30; ++i) {
-      var guesst = (mint + maxt) / 2;
-      var guessx = xForT(guesst);
-      if (x < guessx) {
-        maxt = guesst;
-      } else {
-        mint = guesst;
-      }
-    }
-    return (mint + maxt) / 2;
-  }
-
-  return function bezierClosure(x) {
-    if (x == 0) {
-      return 0;
-    }
-    if (x == 1) {
-      return 1;
-    }
-    return yForT(tForX(x));
-  }
-}
-
-function stepEnd(nsteps) {
-  return function stepEndClosure(x) {
-    return Math.floor(x * nsteps) / nsteps;
-  }
-}
-
-function stepStart(nsteps) {
-  return function stepStartClosure(x) {
-    var result = Math.floor(x * nsteps + 1.0) / nsteps;
-    return (result > 1.0) ? 1.0 : result;
-  }
-}
-
-function waitForAnimationFrames(frameCount) {
-  return new Promise(function(resolve, reject) {
-    function handleFrame() {
-      if (--frameCount <= 0) {
-        resolve();
-      } else {
-        window.requestAnimationFrame(handleFrame); // wait another frame
-      }
-    }
-    window.requestAnimationFrame(handleFrame);
-  });
-}