Rename polymer and cr_elements v0_8 to v1_0

third_party/polymer/v1_0/components/iron-a11y-announcer/README.md

 iron-a11y-announcer
 ===================
 
 `iron-a11y-announcer` is a singleton element that is intended to add a11y
 to features that require on-demand announcement from screen readers. In
 order to make use of the announcer, it is best to request its availability
 in the announcing element.
 
 Example:
 
     Polymer({
       is: 'x-chatty',
       attached: function() {
         // This will create the singlton element if it has not
         // been created yet:
         Polymer.IronA11yAnnouncer.requestAvailability();
       }
     });
     
 After the `iron-a11y-announcer` has been made available, elements can
 make announces by firing bubbling `iron-announce` events.
 
 Example:
 
     this.fire('iron-announce', {
       text: 'This is an announcement!'
     }, { bubbles: true });
     
 Note: announcements are only audible if you have a screen reader enabled.