[Polymer] update third_party polymer

third_party/web-animations-js/sources/README.md

 
 Quick Start
 -----------
 
 To provide native Chrome Web Animation features (`Element.animate` and Playback
 Control) in other browsers, use `web-animations.min.js`. To explore all of the
 proposed Web Animations API, use `web-animations-next.min.js`.
 
 What is Web Animations?
 -----------------------
 
 Web Animations is a new JavaScript API for driving animated content on the web.
 By unifying the animation features of SVG and CSS, Web Animations unlocks
 features previously only usable declaratively, and exposes powerful,
 high-performance animation capabilities to developers.
 
 For more details see the
 [W3C specification](http://w3c.github.io/web-animations/).
 
 What is the polyfill?
 ---------------------
 
-The polyfill is a JavaScript implementation of the Web Animations API. It works
-on modern versions of all major browsers. For more details about browser
-support see <https://www.polymer-project.org/resources/compatibility.html>.
+The polyfill is a JavaScript implementation of the Web Animations API. It is
+supported on modern versions of all major browsers, including:
+
+* Chrome
+* Firefox 27+
+* IE10+ (including Edge)
+* Safari (iOS) 7.1+
+* Safari (Mac) 9+
 
 Getting Started
 ---------------
 
 Here's a simple example of an animation that scales and changes the opacity of
 a `<div>` over 0.5 seconds. The animation alternates producing a pulsing
 effect.
 
-    <script src="web-animations.min.js"></script>
-    <div class="pulse" style="width:150px;">Hello world!</div>
-    <script>
-        var elem = document.querySelector('.pulse');
-        var animation = elem.animate([
-            {opacity: 0.5, transform: "scale(0.5)"},
-            {opacity: 1.0, transform: "scale(1)"}
-        ], {
-            direction: 'alternate',
-            duration: 500,
-            iterations: Infinity
-        });
-    </script>
+```html
+<script src="web-animations.min.js"></script>
+<div class="pulse" style="width:150px;">Hello world!</div>
+<script>
+    var elem = document.querySelector('.pulse');
+    var animation = elem.animate([
+        {opacity: 0.5, transform: "scale(0.5)"},
+        {opacity: 1.0, transform: "scale(1)"}
+    ], {
+        direction: 'alternate',
+        duration: 500,
+        iterations: Infinity
+    });
+</script>
+```
 
 Web Animations supports off-main-thread animations, and also allows procedural
 generation of animations and fine-grained control of animation playback. See
-<http://web-animations.github.io> for ideas and inspiration!
+<http://web-animations.github.io> for ideas and inspiration - or [web-animations-codelabs](https://github.com/web-animations/web-animations-codelabs).
 
 Native Fallback
 ---------------
 
 When the polyfill runs on a browser that implements `Element.animate` and
 `Animation` Playback Control it will detect and use the underlying native
 features.
 
 Different Build Targets
 -----------------------
@@ skipping 56 matching lines @@
 inline style modification will be overwritten by animations.
 Due to browser constraints inline style modification is not supported on iOS 7
 or Safari 6 (or earlier versions).
 
 ### Prefix handling
 
 The polyfill will automatically detect the correctly prefixed name to use when
 writing animated properties back to the platform. Where possible, the polyfill
 will only accept unprefixed versions of experimental features. For example:
 
-    var effect = new KeyframeEffect(elem, {"transform": "translate(100px, 100px)"}, 2000);
+```js
+var effect = new KeyframeEffect(elem, {"transform": "translate(100px, 100px)"}, 2000);
+```
 
 will work in all browsers that implement a conforming version of transform, but
 
-    var effect = new KeyframeEffect(elem, {"-webkit-transform": "translate(100px, 100px)"}, 2000);
+```js
+var effect = new KeyframeEffect(elem, {"-webkit-transform": "translate(100px, 100px)"}, 2000);
+```
 
 will not work anywhere.
 
 API and Specification Feedback
 ------------------------------
 
 File an issue on GitHub: <https://github.com/w3c/web-animations/issues/new>.
 Alternatively, send an email to <public-fx@w3.org> with subject line
 “[web-animations] … message topic …”
 ([archives](http://lists.w3.org/Archives/Public/public-fx/)).
@@ skipping 10 matching lines @@
 When we make a potentially breaking change to the polyfill's API
 surface (like a rename) we will, where possible, continue supporting the
 old version, deprecated, for three months, and ensure that there are
 console warnings to indicate that a change is pending. After three
 months, the old version of the API surface (e.g. the old version of a
 function name) will be removed. *If you see deprecation warnings you
 can't avoid it by not updating*.
 
 We also announce anything that isn't a bug fix on
 [web-animations-changes@googlegroups.com](https://groups.google.com/forum/#!forum/web-animations-changes).