MD Settings: Add "Show Google Now cards in the launcher" row in Search section.

chrome/browser/resources/settings/search_page/search_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="/controls/extension_controlled_indicator.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/i18n_setup.html">
@@ skipping 10 matching lines @@
     <style include="settings-shared md-select">
       #search-wrapper {
         align-items: center;
         display: flex;
         min-height: var(--settings-box-min-height);
       }
 
       iron-icon {
         -webkit-padding-end: 16px;
       }
- 
+
       .indented {
         -webkit-margin-start: 36px;
       }
     </style>
     <settings-animated-pages id="pages" section="search">
       <neon-animatable route-path="default">
         <!-- Omnibox search engine -->
         <div class="settings-box first block">
           <div id="search-wrapper">
             <p class="start">$i18n{searchExplanation}</p>
@@ skipping 15 matching lines @@
                     prefs.default_search_provider.enabled.extensionId]]"
                 extension-name="[[
                     prefs.default_search_provider.enabled.controlledByName]]"
                 extension-can-be-disabled="[[
                     prefs.default_search_provider.enabled.extensionCanBeDisabled]]"
                 on-disable-extension="onDisableExtension_">
             </extension-controlled-indicator>
           </template>
         </div>
 
+        <template is="dom-if" if="[[googleNowAvailable_]]">
+          <!-- Google Now cards in the launcher -->
+          <div class="settings-box continuation">
+            <settings-checkbox id="googleNowEnable"
+                label="$i18n{searchEnableGoogleNowLabel}"
+                pref="{{prefs.google_now_launcher.enabled}}">
+            </settings-checkbox>
+          </div>
+        </template>
+
         <template is="dom-if" if="[[hotwordInfo_.allowed]]">
           <!-- Hotword (OK Google) -->
-          <div class="settings-box two-line">
+          <div class="settings-box two-line continuation">

[fukino, 2016/12/14 16:37:36]

Though this line's change is not a part of Google Now feature, I'm removing the
row separator to match the mock
https://bugs.chromium.org/p/chromium/issues/detail?id=614439#c5.

[stevenjb, 2016/12/14 18:16:06]

Acknowledged.

             <settings-checkbox id="hotwordSearchEnable" class="start"
                 label="$i18n{searchOkGoogleLabel}"
                 sub-label="[[getHotwordSearchEnableSubLabel_(
                            hotwordInfo_.alwaysOn)]]"
                 pref="{{hotwordSearchEnablePref_}}"
                 on-change="onHotwordSearchEnableChange_">
               <a href="$i18nRaw{hotwordLearnMoreUrl}" target="_blank"
                   on-tap="doNothing_">
                 $i18n{searchOkGoogleLearnMore}
               </a>
@@ skipping 49 matching lines @@
         <settings-subpage
             associated-control="[[$$('#subpage-trigger')]]"
             page-title="$i18n{searchEnginesManage}">
           <settings-search-engines-page></settings-search-engines-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="search_page.js"></script>
 </dom-module>