Pull web-animations-js into third-party via the third_party/polymer/reproduce.sh script. Add necess…

third_party/web-animations-js/sources/src/color-handler.js

+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(scope, testing) {
+
+  var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas');
+  canvas.width = canvas.height = 1;
+  var context = canvas.getContext('2d');
+
+  function parseColor(string) {
+    string = string.trim();
+    // The context ignores invalid colors
+    context.fillStyle = '#000';
+    context.fillStyle = string;
+    var contextSerializedFillStyle = context.fillStyle;
+    context.fillStyle = '#fff';
+    context.fillStyle = string;
+    if (contextSerializedFillStyle != context.fillStyle)
+      return;
+    context.fillRect(0, 0, 1, 1);
+    var pixelColor = context.getImageData(0, 0, 1, 1).data;
+    context.clearRect(0, 0, 1, 1);
+    var alpha = pixelColor[3] / 255;
+    return [pixelColor[0] * alpha, pixelColor[1] * alpha, pixelColor[2] * alpha, alpha];
+  }
+
+  function mergeColors(left, right) {
+    return [left, right, function(x) {
+      function clamp(v) {
+        return Math.max(0, Math.min(255, v));
+      }
+      if (x[3]) {
+        for (var i = 0; i < 3; i++)
+          x[i] = Math.round(clamp(x[i] / x[3]));
+      }
+      x[3] = scope.numberToString(scope.clamp(0, 1, x[3]));
+      return 'rgba(' + x.join(',') + ')';
+    }];
+  }
+
+  scope.addPropertiesHandler(parseColor, mergeColors,
+      ['background-color', 'border-bottom-color', 'border-left-color', 'border-right-color',
+       'border-top-color', 'color', 'outline-color', 'text-decoration-color']);
+  scope.consumeColor = scope.consumeParenthesised.bind(null, parseColor);
+  scope.mergeColors = mergeColors;
+
+  if (WEB_ANIMATIONS_TESTING) {
+    testing.parseColor = parseColor;
+  }
+
+})(webAnimations1, webAnimationsTesting);