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

third_party/web-animations-js/sources/src/property-interpolation.js

Index: third_party/web-animations-js/sources/src/property-interpolation.js
diff --git a/third_party/web-animations-js/sources/src/property-interpolation.js b/third_party/web-animations-js/sources/src/property-interpolation.js
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index 0000000000000000000000000000000000000000..8634bf6b89f60e8af5273db8e1639c125a5356d8
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+++ b/third_party/web-animations-js/sources/src/property-interpolation.js
@@ -0,0 +1,62 @@
+// 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 propertyHandlers = {};
+
+  function addPropertyHandler(parser, merger, property) {
+    propertyHandlers[property] = propertyHandlers[property] || [];
+    propertyHandlers[property].push([parser, merger]);
+  }
+  function addPropertiesHandler(parser, merger, properties) {
+    for (var i = 0; i < properties.length; i++) {
+      var property = properties[i];
+      WEB_ANIMATIONS_TESTING && console.assert(property.toLowerCase() === property);
+      addPropertyHandler(parser, merger, property);
+      if (/-/.test(property)) {
+        // Add camel cased variant.
+        addPropertyHandler(parser, merger, property.replace(/-(.)/g, function(_, c) {
+          return c.toUpperCase();
+        }));
+      }
+    }
+  }
+  scope.addPropertiesHandler = addPropertiesHandler;
+
+  function propertyInterpolation(property, left, right) {
+    var handlers = left == right ? [] : propertyHandlers[property];
+    for (var i = 0; handlers && i < handlers.length; i++) {
+      var parsedLeft = handlers[i][0](left);
+      var parsedRight = handlers[i][0](right);
+      if (parsedLeft !== undefined && parsedRight !== undefined) {
+        var interpolationArgs = handlers[i][1](parsedLeft, parsedRight);
+        if (interpolationArgs) {
+          var interp = scope.Interpolation.apply(null, interpolationArgs);
+          return function(t) {
+            if (t == 0) return left;
+            if (t == 1) return right;
+            return interp(t);
+          };
+        }
+      }
+    }
+    return scope.Interpolation(false, true, function(bool) {
+      return bool ? right : left;
+    });
+  }
+  scope.propertyInterpolation = propertyInterpolation;
+
+})(webAnimations1, webAnimationsTesting);
+