Move settings-section animations into setting-section, make better

chrome/browser/resources/settings/settings_main/settings_main.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/html/promise_resolver.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="/about_page/about_page.html">
 <link rel="import" href="/advanced_page/advanced_page.html">
 <link rel="import" href="/basic_page/basic_page.html">
 <link rel="import" href="/route.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_vars_css.html">
@@ skipping 38 matching lines @@
         margin-bottom: 10px;
       }
     </style>
     <content select="paper-icon-button"></content>
     <div id="noSearchResults" hidden$="[[!showNoResultsFound_]]">
       <div>$i18n{searchNoResults}</div>
       <div>$i18nRaw{searchNoResultsHelp}</div>
     </div>
     <template is="dom-if" if="[[showPages_.basic]]">
       <settings-basic-page prefs="{{prefs}}" current-route="{{currentRoute}}"
-          page-visibility="[[pageVisibility]]">
+          page-visibility="[[pageVisibility]]"
+          on-subpage-expand="onSubpageExpand_">
       </settings-basic-page>
     </template>
     <template is="dom-if"
         if="[[showAdvancedSettings_(pageVisibility.advancedSettings)]]">
+

[dschuyler, 2016/08/04 18:36:51]

I'm fine with a blank line or not having
a blank line. I'm pointing it out in case
it's a whoops.

       <template is="dom-if"
-          if="[[showAdvancedToggle_(showPages_.basic, inSubpage_)]]">
+          if="[[showAdvancedToggle_(showPages_.basic, hasExpandedSection_)]]">
         <div id="toggleSpacer"></div>
         <div id="toggleContainer" hidden$="[[showNoResultsFound_]]">
           <div id="advancedToggle" on-tap="toggleAdvancedPage_">
             <span>$i18n{advancedPageTitle}</span>
             <iron-icon icon="[[arrowState_(showPages_.advanced)]]"></iron-icon>
           </div>
         </div>
       </template>
       <template is="dom-if" if="[[showPages_.advanced]]">
         <settings-advanced-page prefs="{{prefs}}"
             current-route="{{currentRoute}}"
-            page-visibility="[[pageVisibility]]">
+            page-visibility="[[pageVisibility]]"
+            on-subpage-expand="onSubpageExpand_">
         </settings-advanced-page>
       </template>
     </template>
     <template is="dom-if" if="[[showPages_.about]]">
       <settings-about-page current-route="{{currentRoute}}">
       </settings-about-page>
     </template>
     <div id="overscroll"></div>
   </template>
   <script src="settings_main.js"></script>
   <script src="/search_settings.js"></script>
 </dom-module>