MD Settings: Lazy load the contents of the "advanced" settings.

chrome/browser/resources/settings/settings_page/main_page_behavior.js

Index: chrome/browser/resources/settings/settings_page/main_page_behavior.js
diff --git a/chrome/browser/resources/settings/settings_page/main_page_behavior.js b/chrome/browser/resources/settings/settings_page/main_page_behavior.js
index 8fdf5f7e6e61f2e949d67e6f8acaa3df9fce936d..04f27de40932130a4387ebe90677fe3412ba8680 100644
--- a/chrome/browser/resources/settings/settings_page/main_page_behavior.js
+++ b/chrome/browser/resources/settings/settings_page/main_page_behavior.js
@@ -116,6 +116,13 @@ var MainPageBehaviorImpl = {
         promise = this.expandSection_(currentSection);
       else if (scrollToSection)
         currentSection.scrollIntoView();
+    } else if (settings.Route.ADVANCED.contains(currentRoute) &&
+        // Need to exclude routes that correspond to 'non-sectioned' children of
+        // ADVANCED, otherwise tryTransitionToSection_ will recurse endlessly.
+        currentRoute != settings.Route.CLEAR_BROWSER_DATA &&
+        currentRoute != settings.Route.TRIGGERED_RESET_DIALOG &&
+        currentRoute != settings.Route.RESET_DIALOG) {

[Dan Beam, 2017/03/21 00:29:26]

can you do this without calling out specific routes?  or maybe make a
settings.isNavigableDialog() that takes a route?

[dpapad, 2017/03/21 00:54:51]

Done.

[Dan Beam, 2017/03/21 01:54:16]

is it OK that children of BASIC are included in this?

[dpapad, 2017/03/21 05:36:36]

Yes should be fine, because the 1st part of the condition already returns false
when currentRoute is a not a child of ADVANCED.

+      promise = this.$$('#advancedPageTemplate').get();
     }
 
     // When this animation ends, another may be necessary. Call this function