Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html

Index: third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html
diff --git a/third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html b/third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html
index 2ca804b06da8c25d2bb6c4e17426d8d6cc25978b..e6e151e8c58d401ce1e6cd62c15c1558101fa98b 100644
--- a/third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html
+++ b/third_party/polymer/v1_0/components-chromium/iron-meta/iron-meta.html
@@ -23,25 +23,25 @@ Examples:
 
 If I create an instance like this:
 
-    <iron-meta key="info" keyUrl="foo/bar"></iron-meta>
+    <iron-meta key="info" value="foo/bar"></iron-meta>
 
-Note that keyUrl="foo/bar" is the metadata I've defined. I could define more
+Note that value="foo/bar" is the metadata I've defined. I could define more
 attributes or use child nodes to define additional metadata.
 
 Now I can access that element (and it's metadata) from any iron-meta instance
 via the byKey method, e.g.
 
-    meta.byKey('info').getAttribute('keyUrl').
+    meta.byKey('info').getAttribute('value').
 
 Pure imperative form would be like:
 
-    document.createElement('iron-meta').byKey('info').getAttribute('keyUrl');
+    document.createElement('iron-meta').byKey('info').getAttribute('value');
 
 Or, in a Polymer element, you can include a meta in your template:
 
     <iron-meta id="meta"></iron-meta>
     ...
-    this.$.meta.byKey('info').getAttribute('keyUrl');
+    this.$.meta.byKey('info').getAttribute('value');
 
 @group Iron Elements
 @demo demo/index.html