Enable submitting SAML smart card dialog with Enter

Bug: 1027987
Change-Id: I5b4c779717217a40807475a48b74529752cb0f2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936292Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@google.com>
Cr-Commit-Position: refs/heads/master@{#719546}

chrome/browser/resources/chromeos/login/security_token_pin.html

@@ -30,7 +30,7 @@
               has-error="[[hasError_(parameters, userEdited_)]]"
               aria-label$="[[getAriaLabel_(locale, parameters, errorLabelId_,
                                            userEdited_)]]"
-              on-pin-change="onPinChange_">
+              on-pin-change="onPinChange_" on-submit="onSubmit_">
             <div id="errorContainer" problem
                 hidden="[[!hasError_(parameters, userEdited_)]]">
               <iron-icon id="errorIcon" icon="cr:error-outline"></iron-icon>
@@ -52,7 +52,7 @@
       </div>
       <div slot="bottom-buttons" class="layout horizontal justified">
         <oobe-back-button on-tap="onBackClicked_"></oobe-back-button>
-        <oobe-next-button on-tap="onNextClicked_"
+        <oobe-next-button on-tap="onSubmit_"
             disabled="[[processingCompletion_]]"></oobe-next-button>
       </div>
     </oobe-dialog>

chrome/browser/resources/chromeos/login/security_token_pin.js

@@ -91,14 +91,14 @@ Polymer({
   },
 
   /**
-   * Invoked when the "Next" button is clicked.
+   * Invoked when the "Next" button is clicked or Enter is pressed.
    * @private
    */
-  onNextClicked_: function() {
+  onSubmit_: function() {
     if (this.processingCompletion_) {
-      // Race condition: This could happen if Polymer hasn't yet updated the
-      // "disabled" state of the "Next" button before the user clicked on it for
-      // the second time.
+      // Race condition: This could happen if the previous request has not yet
+      // been completed before the next one is sent (for example by pressing
+      // Enter twice)
       return;
     }
     this.processingCompletion_ = true;