MD Settings: Implement search URLs.

chrome/browser/resources/settings/settings_ui/settings_ui.html

 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-header-panel/paper-header-panel.html">
 <link rel="import" href="/direction_delegate.html">
 <link rel="import" href="/global_scroll_target_behavior.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
@@ skipping 74 matching lines @@
         overflow: auto;
       }
     </style>
     <settings-prefs id="prefs" prefs="{{prefs}}"></settings-prefs>
     <cr-toolbar page-name="$i18n{settings}"
         clear-label="$i18n{clearSearch}"
         search-prompt="$i18n{searchPrompt}"
         on-cr-toolbar-menu-tap="onMenuButtonTap_"
         spinner-active="[[toolbarSpinnerActive_]]"
         menu-label="$i18n{menuButtonLabel}"
+        on-search-changed="onSearchChanged_"

[tommycli, 2016/11/01 21:05:26]

nit: it seems like this event should be called on-search-query-changed? Can be
separate CL, just nitpicking.

[dpapad, 2016/11/01 22:02:02]

The native HTML <input type="search"> element is firing a simple 'search' event.
We chose 'search-changed' for the shared cr-search-field element, since unlike
the native element, it only fires if the value actually changed. I think is fine
since it is shorter than 'search-query-changed' without being too cryptic
hopefully.

[tommycli, 2016/11/01 22:05:47]

Acknowledged.

         show-menu>
     </cr-toolbar>
     <app-drawer swipe-open>
       <div class="drawer-header">$i18n{settings}</div>
       <div class="drawer-content">
         <template is="dom-if" id="drawerTemplate">
           <settings-menu page-visibility="[[pageVisibility_]]"
               on-iron-activate="onIronActivate_"
               advanced-opened="{{advancedOpened_}}">
           </settings-menu>
         </template>
       </div>
     </app-drawer>
     <paper-header-panel id="headerPanel" mode="waterfall">
       <settings-main prefs="{{prefs}}"
           toolbar-spinner-active="{{toolbarSpinnerActive_}}"
           page-visibility="[[pageVisibility_]]"
-          advanced-toggle-expanded="{{advancedOpened_}}">
+          advanced-toggle-expanded="{{advancedOpened_}}"
+          search-query="[[searchQuery_]]">
       </settings-main>
     </paper-header-panel>
   </template>
   <script src="settings_ui.js"></script>
 </dom-module>