Update web-platform-tests to revision f0cb9071aea5ce5b641fcba5f362a0796bdc70bc

tests/wpt/web-platform-tests/css/css-scroll-snap/support/common.css

@@ -0,0 +1,44 @@
+body {
+  margin: 0;
+}
+
+#scroller {
+  position: absolute;
+  width: 400px;
+  height: 400px;
+  overflow: scroll;
+  padding: 0;
+
+  scroll-snap-type: both mandatory;
+}
+
+.snap {
+  position: absolute;
+  width: 200px;
+  height: 200px;
+  background-color: blue;
+
+  scroll-snap-align: start;
+}
+
+#space {
+  position: absolute;
+  width: 1000px;
+  height: 1000px;
+}
+
+.left {
+  left: 0;
+}
+
+.top {
+  top: 0;
+}
+
+.right {
+  left: 400px;
+}
+
+.bottom {
+  top: 400px;
+}

tests/wpt/web-platform-tests/css/css-scroll-snap/support/common.js

@@ -0,0 +1,64 @@
+const KEY_CODE_MAP = {
+  'ArrowLeft':  '\uE012',
+  'ArrowUp':    '\uE013',
+  'ArrowRight': '\uE014',
+  'ArrowDown':  '\uE015',
+  'PageUp':     '\uE00E',
+  'PageDown':   '\uE00F',
+  'End':        '\uE010',
+  'Home':       '\uE011',
+  'Space':      ' ',
+};
+
+// Send key event to the target element using test driver. Supports human
+// friendly key names for common keyboard scroll operations e.g., arrow keys,
+// page keys, etc.
+async function keyPress(target, key) {
+  let code = key;
+  if (KEY_CODE_MAP.hasOwnProperty(key))
+    code = KEY_CODE_MAP[key];
+
+  // First move pointer on target and click to ensure it receives the key.
+  let actions = new test_driver.Actions()
+    .pointerMove(0, 0, {origin: target})
+    .pointerDown()
+    .pointerUp()
+    .keyDown(code)
+    .keyUp(code);
+
+  return actions.send();
+}
+
+// Use rAF to wait for the value of the getter function passed to not change for
+// at least 15 frames or timeout after 1 second.
+//
+// Example usage:
+//    await waitForAnimationEnd(() => scroller.scrollTop);
+function waitForAnimationEnd(getValue) {
+  const TIMEOUT = 1000; // milliseconds
+  const MAX_UNCHANGED_FRAMES = 15;
+
+  const start_time = performance.now();
+  let last_changed_frame = 0;
+  let last_value = getValue();
+
+  return new Promise((resolve, reject) => {
+    function tick(frames, time) {
+    // We requestAnimationFrame either for TIMEOUT milliseconds or until
+    // MAX_UNCHANGED_FRAMES with no change have been observed.
+      if (time - start_time > TIMEOUT ||
+          frames - last_changed_frame >= MAX_UNCHANGED_FRAMES) {
+        resolve();
+      } else {
+        current_value = getValue();
+        if (last_value != current_value) {
+          last_changed_frame = frames;
+          last_value = current_value;
+        }
+        requestAnimationFrame(tick.bind(this, frames + 1));
+      }
+    }
+    tick(0, start_time);
+  });
+}
+