The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/342afc7737e47aea1d7b2bf461fd2c40be2e19eb

commit 342afc7737e47aea1d7b2bf461fd2c40be2e19eb
Author: Qiang Xu <warx@chromium.org>
Date: Tue Jun 27 19:33:49 2017

cros: add new highlight rounded rectangle to selected suggested/all apps

Changes:
(1) For keyboard focus, highlights the app using a rounded rectangle of
FFF 12% for both suggested and all apps.
(2) also in this CL, fix the preferred size of indicator chip view.
(3) also in this CL, fix the left margin issue of suggested app tiles,
so that they are horizontally centered in the screen.

screenshot of suggested apps tiles:
https://screenshot.googleplex.com/EoQA0rLFYKM
screenshot of all apps tiles:
https://screenshot.googleplex.com/vT1366vaXuj

Bug:  735708 
TEST: tested with and without --enable-features=EnableFullscreenAppList
Change-Id: Ie634cb94de7ac1c18526228dafd71b9b5f642a62
Reviewed-on: https://chromium-review.googlesource.com/548240
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482713}
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/app_list_constants.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/app_list_constants.h
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/app_list_item_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/indicator_chip_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/search_result_tile_item_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/start_page_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/suggestions_container_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/tile_item_view.cc
[modify] https://crrev.com/342afc7737e47aea1d7b2bf461fd2c40be2e19eb/ui/app_list/views/tile_item_view.h

Not really fixed all of them: after the expand arrow view is updated, we shall add focus highlight to it.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b80af55bbd0fc71afbdbfdaa95160e8947bf4b0e

commit b80af55bbd0fc71afbdbfdaa95160e8947bf4b0e
Author: Qiang Xu <warx@chromium.org>
Date: Fri Jun 30 16:28:59 2017

cros: keyboard focus for expand arrow button

changes:
(1) When expand arrow selected, draw a #FFF 12%,  18px radius circle.
(2) add keyboard focus behaviors related with expand arrow button:
a. when expand arrow selected:
arrow up/arrow left/shift-tab move focus to the last suggestion tile,
arrow right/tab move focus to the first suggestion tile.
b. when focus is inside suggestions container, arrow down would move
focus to expand arrow button; when focus is at the last tile of
suggestions, arrow right would move focus to expand arrow button.
c. tab/shift-tab just work as usual.

tested with and without --enable-features=EnableFullscreenAppList

Bug:  735708 ,  734164 
TEST: screenshot of highlight:
https: //screenshot.googleplex.com/YdFbRnKVXyF
Change-Id: Ice124bb69123b1331608c6a45b17a0debdc6335c
Reviewed-on: https://chromium-review.googlesource.com/557464
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#483728}
[modify] https://crrev.com/b80af55bbd0fc71afbdbfdaa95160e8947bf4b0e/ui/app_list/views/expand_arrow_view.cc
[modify] https://crrev.com/b80af55bbd0fc71afbdbfdaa95160e8947bf4b0e/ui/app_list/views/expand_arrow_view.h
[modify] https://crrev.com/b80af55bbd0fc71afbdbfdaa95160e8947bf4b0e/ui/app_list/views/start_page_view.cc