MD Settings: Set overscroll before attempting to scroll to section

chrome/browser/resources/settings/settings_main/settings_main.js

Index: chrome/browser/resources/settings/settings_main/settings_main.js
diff --git a/chrome/browser/resources/settings/settings_main/settings_main.js b/chrome/browser/resources/settings/settings_main/settings_main.js
index 27a07401995eb905a2e33c392078ebbdb7222b34..fe689f8fc18fcc978a72196cd2989f7b950673b7 100644
--- a/chrome/browser/resources/settings/settings_main/settings_main.js
+++ b/chrome/browser/resources/settings/settings_main/settings_main.js
@@ -188,7 +188,10 @@ Polymer({
       }
     }
 
-    // Wait for any other changes prior to calculating the overflow padding.
+    // Calculate the overflow padding.
+    this.setOverscroll_(this.overscrollHeight_());

[dschuyler, 2016/09/08 21:00:37]

I added some logging to see how often this call
has correct data (compared to the version called
after a timeout). It occasionally does have the 
correct value, such as when the net effect is 
scrolling down to a section. It will also get 
incorrect values, such as when the net effect is
scrolling up to a section.

Is there some way to chain the actions with a 
promise or events (avoiding timeouts or using
stale data)?

+
+    // Wait for any other changes, then calculate the overflow padding again.
     setTimeout(function() {
       // Ensure any dom-if reflects the current properties.
       Polymer.dom.flush();