Added strings of i18n and made the pin-keyboard work for rtl lang.

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

Index: chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
diff --git a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
index dfc111d4c5fcd7c32df8aa1e7a95762d0894bfbb..532fd004da8c98cd02d5d2837fe93860c5e93544 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
@@ -25,7 +25,20 @@
 Polymer({
   is: 'pin-keyboard',
 
+  behaviors: [
+    I18nBehavior,
+  ],
+
   properties: {
+    /**
+     * Whether or not the keyboard's input element should be numerical
+     * or password.
+     */
+    enablePassword: {
+      type: Boolean,
+      value: false
+    },
+
     /** The value stored in the keyboard's input element. */
     value: {
       type: String,
@@ -84,5 +97,30 @@ Polymer({
       event.preventDefault();
       return;
     }
+  },
+
+  /**
+   * Computes whether the input type for the pin input should be password or
+   * numerical.

[jdufault, 2016/06/30 18:22:12]

All three methods should have an @private annotation.

[sammiequon, 2016/06/30 22:18:41]

Done.

+   */
+  computeInputType_: function(enablePassword) {
+    return enablePassword ? 'password' : 'number';
+  },
+
+  /** Computes the value of the pin input placeholder. */
+  computeInputPlaceholder_: function(enablePassword) {
+    return enablePassword ? this.i18n('pinKeyboardPlaceholderPinPassword') :
+                            this.i18n('pinKeyboardPlaceholderPin');
+  },
+
+  /** Computes the direction of the pin input. */
+  computeInputClass_: function(password) {
+    // +password will convert a string to a number or to NaN if that's not
+    // possible. Number.isInteger will verify the value is not a NaN and that it
+    // does not contain decimals.
+    //
+    // This heuristic will fail for inputs like '1.0'.
+    var enableRtl = (document.dir == 'rtl') && !Number.isInteger(+password);
+    return enableRtl ? 'input-non-pin' : '';
   }
 });