Pin keyboard use enter to submit when focus is not on a button.

chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html

Index: chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html
diff --git a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html
index 59895a3bcf3f59a19afbcd818ab15f33a404c50f..ec2427ce413bb9cf5d7b1536998e93adafad694c 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html
@@ -125,7 +125,9 @@
           <input id="pin-input" type="number" placeholder="Enter PIN"
                  value="{{value::input}}"
                  on-keydown="onInputKeyDown_"></input>
-          <paper-button class="digit-button first-row submit-button"
+          <paper-button class="digit-button submit-button"
+                        on-focus="onButtonFocus_"
+                        on-keydown="onButtonKeyDown_"
                         on-tap="firePinSubmitEvent_">
             <div class$="icon-container [[computeSubmitClass_(value)]]">
                 <iron-icon class="icon" icon="icons:forward"><iron-icon>
@@ -134,48 +136,60 @@
         </div>
 
         <div class="row keyboard">
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="1">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="1">
             <inner-text>1</inner-text>
           </paper-button>
-          <paper-button class="digit-button center-button" on-tap="onNumberTap_"
-                        value="2">
+          <paper-button class="digit-button center-button"
+                        on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="2">
             <inner-text>2</inner-text>
           </paper-button>
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="3">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="3">
             <inner-text>3</inner-text>
           </paper-button>
         </div>
         <div class="row keyboard">
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="4">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="4">
             <inner-text>4</inner-text>
           </paper-button>
-          <paper-button class="digit-button center-button" on-tap="onNumberTap_"
-                        value="5">
+          <paper-button class="digit-button center-button"
+                        on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="5">
             <inner-text>5</inner-text>
           </paper-button>
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="6">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="6">
             <inner-text>6</inner-text>
           </paper-button>
         </div>
         <div class="row keyboard">
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="7">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="7">
             <inner-text>7</inner-text>
           </paper-button>
-          <paper-button class="digit-button center-button" on-tap="onNumberTap_"
-                        value="8">
+          <paper-button class="digit-button center-button"
+                        on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="8">
             <inner-text>8</inner-text>
           </paper-button>
-          <paper-button class="digit-button" on-tap="onNumberTap_" value="9">
+          <paper-button class="digit-button" on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="9">
             <inner-text>9</inner-text>
           </paper-button>
         </div>
         <div class="row keyboard">
           <div class="digit-button"></div>
-          <paper-button class="digit-button center-button" on-tap="onNumberTap_"
-                        value="0">
+          <paper-button class="digit-button center-button"
+                        on-keyup="onButtonKeyUp_"
+                        on-tap="onNumberTap_" value="1">
             <inner-text>0</inner-text>
           </paper-button>
-          <paper-button class="digit-button clear-button" on-tap="onPinClear_">
+          <paper-button class="digit-button clear-button"
+                        on-keyup="onButtonKeyUp_"
+                        on-tap="onPinClear_">
             <div class="icon-container">
               <iron-icon class="icon" icon="icons:clear"><iron-icon>
             </div>