The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ded0cc6677d07279b6722bd73ed0f32723d90283

commit ded0cc6677d07279b6722bd73ed0f32723d90283
Author: michaelpg <michaelpg@chromium.org>
Date: Mon Aug 01 19:14:04 2016

MD Settings: Fix starting height of expanding sections

Changes to the way the route is set have shuffled how currentRoute changes
propagate, making callbacks run at different times than before.

One result is that the settings-animated-pages selects its subpage before the
MainPageBehavior gets a chance to freeze the section's height. The fix, albeit
a bit hacky, is to freeze the height of settings-animated-pages before selecting
a subpage from the main page.

I also considered ways of changing the order of callbacks or adding asynchronicity...
but that's just adding fuel to the fire. Subpages opening/closing will be done
by events soon, so we can fire an event here eventually.

R=tommycli@chromium.org
BUG= 633046 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2197093002
Cr-Commit-Position: refs/heads/master@{#409014}

[modify] https://crrev.com/ded0cc6677d07279b6722bd73ed0f32723d90283/chrome/browser/resources/settings/settings_page/settings_animated_pages.html
[modify] https://crrev.com/ded0cc6677d07279b6722bd73ed0f32723d90283/chrome/browser/resources/settings/settings_page/settings_animated_pages.js