commit 872e2db0bbc390dc17223d85a48581549b8a0836
author calamity <calamity@chromium.org> Fri May 12 03:02:43 2017
committer Commit bot <commit-bot@chromium.org> Fri May 12 03:03:04 2017
tree d05013e1c16368a8603b3dad29e49c3cf500f115
parent 25aed983a45bceabfc3d82393a74facd2e86a1cf

[MD Bookmarks] Allow left/right keys to close/open folders in sidebar.

This CL makes the left and right arrows close and open folders in the
sidebar respectively. A closed folder will transfer selection to the
parent when left is pressed and an open folder will transfer selection
to its first child.

BUG=692844
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2857893002
Cr-Commit-Position: refs/heads/master@{#471199}