GitLab

Add AppBarNavigationController.h/m files and ColorThemer sub directory
Also added strings needed for AppBarViewController

Bug: 880938
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I0b93329a2eca0b06b3ae803953b03912d105da57
Reviewed-on: https://chromium-review.googlesource.com/1208440Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589089}