Add the authenticate screen for the quick unlock settings.

chrome/browser/resources/settings/people_page/quick_unlock_authenticate.html

+<link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
+<link rel="import" href="/people_page/quick_unlock_routing_behavior.html">
+<link rel="import" href="/settings_page/settings_section.html">
+<link rel="import" href="/settings_shared_css.html">
+
+<dom-module id="settings-quick-unlock-authenticate">
+  <template>
+    <style include="settings-shared"></style>
+    <style>
+      #profile-name {
+        margin-right: 16px;
+      }
+
+      #password-input {
+        display: inline-block;
+      }
+
+      .secondary-action {
+        /* Increase the length of the vertical line, since it has no actual
+           content to be sized to. */
+        padding: 10px 0 10px 0;
+      }
+    </style>
+
+    <div>
+      <div class="settings-box">$i18n{quickUnlockConfirmLogin}</div>
+
+      <div class="settings-box block first">
+        <span id="profile-name">
+          [[profileName]]
+        </span>
+
+        <!-- The secondary-action would normally be on the paper-input element,
+          but that makes the secondary-action have a long top-section because
+          the paper-input has an floating text element appear above it which is
+          invisible when there is no content inside the input. -->
+        <span class="secondary-action"></span>
+
+        <paper-input id="password-input" type="password"
+                     label="$i18n{quickUnlockPasswordLabel}"
+                     value="{{password_}}"
+                     invalid$="[[passwordInvalid_]]"
+                     on-change="checkPasswordNow_"
+                     on-input="startDelayedPasswordCheck_"
+                     error-message="$i18n{quickUnlockInvalidPassword}"
+                     aria-disabled="false">
+        </paper-input>
+      </div>
+    </div>
+  </template>
+
+  <script src="quick_unlock_authenticate.js"></script>
+</dom-module>