Roll Polymer from 1.5.0 -> 1.6.0 to pick up native CSS custom props

third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html

Index: third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html
diff --git a/third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html b/third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html
index 129332510fe58978d1519ed671d661477303521f..052f32efe899c2bb0d6548c0a72718fc3eb17c37 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html
+++ b/third_party/polymer/v1_0/components-chromium/paper-input/paper-input.html
@@ -97,14 +97,14 @@ style this element.
 
       <content select="[prefix]"></content>
 
-      <label hidden$="[[!label]]" aria-hidden="true">[[label]]</label>
+      <label hidden$="[[!label]]" aria-hidden="true" for="input">[[label]]</label>
 
       <input is="iron-input" id="input" aria-labelledby$="[[_ariaLabelledBy]]" aria-describedby$="[[_ariaDescribedBy]]" disabled$="[[disabled]]" title$="[[title]]" bind-value="{{value}}" invalid="{{invalid}}" prevent-invalid-input="[[preventInvalidInput]]" allowed-pattern="[[allowedPattern]]" validator="[[validator]]" type$="[[type]]" pattern$="[[pattern]]" required$="[[required]]" autocomplete$="[[autocomplete]]" autofocus$="[[autofocus]]" inputmode$="[[inputmode]]" minlength$="[[minlength]]" maxlength$="[[maxlength]]" min$="[[min]]" max$="[[max]]" step$="[[step]]" name$="[[name]]" placeholder$="[[placeholder]]" readonly$="[[readonly]]" list$="[[list]]" size$="[[size]]" autocapitalize$="[[autocapitalize]]" autocorrect$="[[autocorrect]]" on-change="_onChange" tabindex$="[[tabindex]]" autosave$="[[autosave]]" results$="[[results]]" accept$="[[accept]]" multiple$="[[multiple]]">
 
       <content select="[suffix]"></content>
 
       <template is="dom-if" if="[[errorMessage]]">
-        <paper-input-error>[[errorMessage]]</paper-input-error>
+        <paper-input-error aria-live="assertive">[[errorMessage]]</paper-input-error>
       </template>
 
       <template is="dom-if" if="[[charCounter]]">