happy to take this one if no one is started

All yours, but it's currently blocked  crbug.com/735702 

i can take that one too. Again, if you haven't started.

Thanks, all yours!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fc6f4ff899528aeb24316593094644c2b00e1178

commit fc6f4ff899528aeb24316593094644c2b00e1178
Author: Qiang Xu <warx@chromium.org>
Date: Wed Jun 28 22:12:22 2017

cros: all apps page #02 UI specifications

changes:
This CL is mainly dealing with the UI layout of all apps page #02 and
all subsequent pages.
(1) 5 rows 5 cols
(2) search box: 24px top padding, 21px bottom padding, fixed width (no
longer in line with apps grid view's width.
(3) add all apps indicator chip, 8px bottom padding with apps grid.
(4) apps grid: 24px horizontal padding, 12px vertical padding.
(5) page switcher view: remove 24px padding for its width.

UI specification: https://screenshot.googleplex.com/0A4VEH19ukJ
WIP screenshot: https://screenshot.googleplex.com/hmWYqP99kPJ

TODO: page switcher view layout.

flag, attached screenshot.

R: xiyuan@chromium.org
Bug:  735702 ,  735709 
TEST: tested with and without --enable-features=EnableFullscreenAppList
Change-Id: I26b065f40e9e0f5338a64b04926e8c52b90da16d
Reviewed-on: https://chromium-review.googlesource.com/551484
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#483166}
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/app_list_constants.cc
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/app_list_constants.h
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/apps_container_view.cc
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/apps_container_view.h
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/apps_grid_view.cc
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/contents_view.cc
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/contents_view.h
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/page_switcher_vertical.cc
[modify] https://crrev.com/fc6f4ff899528aeb24316593094644c2b00e1178/ui/app_list/views/start_page_view.cc

Dup into  issue 735702 , as these two are strongly related.