Composited Animations: Introduce pixel-ref layout tests.

third_party/WebKit/LayoutTests/animations/resources/composited-animation-test.js

Index: third_party/WebKit/LayoutTests/animations/resources/composited-animation-test.js
diff --git a/third_party/WebKit/LayoutTests/animations/resources/composited-animation-test.js b/third_party/WebKit/LayoutTests/animations/resources/composited-animation-test.js
new file mode 100644
index 0000000000000000000000000000000000000000..dfdbd3a1294bf16649d065f16739f49c88fc02d3
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/animations/resources/composited-animation-test.js
@@ -0,0 +1,209 @@
+'use strict';
+
+class CompositedAnimationTestCommon {
+  constructor(composited) {
+    this.composited = composited;
+    this.tests = [];
+    this.nextInstanceId = 1;
+
+    this.createStyles();
+    this.createStaticElements();
+  }
+
+  createStyles() {
+    var styleSheet = document.createElement('style');
+    styleSheet.textContent = `
+    .item {
+      width: 20px;
+      height: 20px;
+      position: relative;
+      background: black;
+      float: left;
+    }
+    .marker {
+      width: 5px;
+      height: 5px;
+      display: inline-block;
+      background: orange;
+      margin: 15px;
+    }`;
+
+    document.head.appendChild(styleSheet);
+  }
+
+  createStaticElements() {
+    this.error = document.createElement('span');
+    this.error.style.color = 'red';
+    document.body.appendChild(this.error);
+
+    this.wrapper = document.createElement('div');
+    document.body.appendChild(this.wrapper);
+  }
+
+  createTestElements() {
+    this.tests.forEach(test => {
+      test.testWrapper = document.createElement('div');
+      this.wrapper.appendChild(test.testWrapper);
+
+      test.data.samples.forEach(sample => {
+        var element = document.createElement('div');
+
+        // Add marker custom style as inline style.
+        // Do not create marker if empty string specified.
+        if (test.data.markerStyle == null || test.data.markerStyle != '') {
+          var content = document.createElement('div');
+          content.classList.add('marker');
+          content.style.cssText = test.data.markerStyle;
+          element.appendChild(content);
+        }
+
+        element.classList.add('item');
+
+        // Add custom style as inline style.
+        var elementStyle = '';
+        if (this.suiteStyle)
+          elementStyle = this.suiteStyle;
+        if (test.data.style)
+          elementStyle += test.data.style;
+        if (elementStyle)
+          element.style.cssText = elementStyle;
+
+        // New line.
+        if (!test.testWrapper.hasChildNodes())
+          element.style.clear = 'left';
+
+        test.testWrapper.appendChild(element);
+
+        test.instances.push({
+          element: element,
+          animation: null,
+          id: this.nextInstanceId++
+        });
+      });
+    });
+
+    // Update all lifecycle phases to propagate all the objects to
+    // the compositor and to clear all the dirty flags.
+    if (window.internals)
+      internals.forceCompositingUpdate(document);
+  }
+
+  startAnimations() {
+    // We want to achieve desired accuracy for splines using a specific duration.
+    // TODO(loyso): Duration mustn't affect cc/blink consistency.
+    // Taken from cubic_bezier.cc:
+    var kBezierEpsilon = 1e-7;
+    // Reverse the blink::accuracyForDuration function to calculate duration
+    // from epsilon:
+    var duration = 1000 * 1.0 / (kBezierEpsilon * 200.0);
+
+    this.tests.forEach(test => {
+      if (test.instances.length != test.data.samples.length)
+        this.reportError(test, `instances.length=${test.instances.length} != samples.length=${test.data.samples.length}`);
+
+      for (var i = 0; i < test.instances.length; i++) {
+        var sample = test.data.samples[i];
+        var instance = test.instances[i];
+
+        // Use negative animation delays to specify sampled time for each animation.
+        instance.animation = instance.element.animate(test.data.keyframes, {
+            duration: duration,
+            iterations: Infinity,
+            delay: -duration * sample.at,
+            easing: test.data.easing
+        });
+
+        if (window.internals && !this.composited)
+          internals.disableCompositedAnimation(instance.animation);
+      }
+    });
+
+    if (window.internals)
+      internals.pauseAnimations(0);
+  }
+
+  assertAnimationCompositedState() {
+    this.tests.forEach(test => {
+      test.instances.forEach(instance => {
+        var composited = internals.isCompositedAnimation(instance.animation);
+        if (composited != this.composited)
+          this.reportError(test, `Animation ${composited ? 'is' : 'is not'} running on the compositor.`);
+      });
+    });
+  }
+
+  reportError(test, message) {
+    if (!this.error.textContent)
+      this.error.textContent = `${this.composited ? 'Tests:' : 'TestExpectations:'} `;
+
+    this.error.textContent += `${test.name}: ${message} `;
+  }
+
+  layoutAndPaint() {
+    if (window.testRunner)
+      testRunner.waitUntilDone();
+
+    requestAnimationFrame(() => {
+      if (window.internals)
+        this.assertAnimationCompositedState();
+      if (window.testRunner)
+        testRunner.notifyDone();
+    });
+  }
+
+  registerTestsData(testSuiteData) {
+    this.suiteStyle = testSuiteData.style;
+    for (var testName in testSuiteData.tests) {
+      var testData = testSuiteData.tests[testName];
+      this.tests.push({
+        name: testName,
+        data: testData,
+        instances: []
+      });
+    }
+  }
+
+  run() {
+    this.createTestElements();
+    this.startAnimations();
+    this.layoutAndPaint();
+  }
+}
+
+
+class CompositedAnimationTest extends CompositedAnimationTestCommon {
+  constructor() {
+    var composited = true;
+    super(composited)
+  }
+}
+
+
+class CompositedAnimationTestExpected extends CompositedAnimationTestCommon {
+  constructor() {
+    var composited = false;
+    super(composited)
+  }
+}
+
+
+var runCompositedAnimationTests = function(testSuiteData) {
+  var test = new CompositedAnimationTest();
+  test.registerTestsData(testSuiteData);
+  test.run();
+}
+
+var runCompositedAnimationTestExpectations = function(testSuiteData) {
+  var test = new CompositedAnimationTestExpected();
+  test.registerTestsData(testSuiteData);
+  test.run();
+}
+
+var getLinearSamples = function(n, start, end) {
+  var arr = [];
+  var spread = end - start;
+  for (var i = 0; i <= n; i++)
+    arr.push(i * spread / n + start);
+  return arr.map(t => { return {at: t} });
+}
+