MD History: Hide sidebar behind toolbar menu button
This hides the sidebar and displays a menu button in the toolbar which
opens it in an overlay drawer on the left side of the screen. Also
updates the sidebar menu to have better tab focusing behavior.
This causes the search field in the toolbar to appear slightly
off-center, this will be fixed in a follow-up patch.
BUG=
608968,
620030
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/105cabbb6d80245ba69e9097013594a03069f8cc
Cr-Commit-Position: refs/heads/master@{#403098}