MD Settings: Add ImportDataDialog tests.

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

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.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-spinner/paper-spinner.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/controls/settings_toggle_button.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/md_select_css.html">
 <link rel="import" href="/people_page/import_data_browser_proxy.html">
 <link rel="import" href="/prefs/prefs_behavior.html">
 
 <dom-module id="settings-import-data-dialog">
   <template>
     <style include="settings-shared md-select">
       .description {
         align-items: center;
         display: flex;
         min-height: var(--settings-row-min-height);
       }
 
       paper-spinner {
         margin: 0 8px;
       }
 
-      #success-icon {
+      #successIcon {
         fill: var(--paper-blue-600);
         height: 80px;
         margin: auto;
         width: 100%;
       }
     </style>
     <dialog is="cr-dialog" id="dialog">
       <div class="title">$i18n{importTitle}</div>
       <div class="body">
         <div hidden$="[[!hasImportStatus_(
             importStatusEnum_.SUCCEEDED, importStatus_)]]">
-          <iron-icon id="success-icon" icon="settings:check-circle">
+          <iron-icon id="successIcon" icon="settings:check-circle">
           </iron-icon>
           <div hidden$="[[!prefs.import_bookmarks.value]]">
             <div class="description">$i18n{importSuccess}</div>
             <settings-toggle-button class="start"
                 label="$i18n{showBookmarksBar}"
                 pref="{{prefs.bookmark_bar.show_on_all_tabs}}">
             </settings-toggle-button>
           </div>
         </div>
 
@@ skipping 36 matching lines @@
           </settings-checkbox>
         </div>
       </div>
       <div class="button-container">
         <paper-spinner
             active="[[hasImportStatus_(
                 importStatusEnum_.IN_PROGRESS, importStatus_)]]"
             hidden="[[hasImportStatus_(
                 importStatusEnum_.SUCCEEDED, importStatus_)]]">
         </paper-spinner>
-        <paper-button class="cancel-button" id="cancel"
+        <paper-button id="cancel" class="cancel-button"
             hidden="[[hasImportStatus_(
                 importStatusEnum_.SUCCEEDED, importStatus_)]]"
             disabled="[[hasImportStatus_(
                 importStatusEnum_.IN_PROGRESS, importStatus_)]]"
             on-tap="closeDialog_">
           $i18n{cancel}
         </paper-button>
-        <paper-button class="action-button"
+        <paper-button id="import" class="action-button"
             hidden="[[hasImportStatus_(
                 importStatusEnum_.SUCCEEDED, importStatus_)]]"
             disabled="[[shouldDisableImport_(
                 importStatus_, noImportDataTypeSelected_)]]"
             on-tap="onActionButtonTap_">
           [[getActionButtonText_(selected_)]]
         </paper-button>
 
-        <paper-button class="action-button"
+        <paper-button id="done" class="action-button"
             hidden$="[[!hasImportStatus_(
                 importStatusEnum_.SUCCEEDED, importStatus_)]]"
             on-tap="closeDialog_">$i18n{done}</paper-button>
       </div>
     </dialog>
   </template>
   <script src="import_data_dialog.js"></script>
 </dom-module>