The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e081605169d6f3c605d52050a3a13522a473daf6

commit e081605169d6f3c605d52050a3a13522a473daf6
Author: weidongg <weidongg@chromium.org>
Date: Tue Jun 13 23:42:49 2017

Vertically centered app list page switcher

Change the app list page switcher from horizontally center to vertically
center. All changes are behind a flag. This is one part of moving to
full screen app list.

BUG= 732067 
TEST="Add --enable-features=EnableFullscreenAppList to see the changes"

Review-Url: https://codereview.chromium.org/2938563002
Cr-Commit-Position: refs/heads/master@{#479206}

[modify] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/BUILD.gn
[modify] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/apps_grid_view.cc
[modify] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/page_switcher.h
[rename] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/page_switcher_horizontal.cc
[add] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/page_switcher_horizontal.h
[copy] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/page_switcher_vertical.cc
[add] https://crrev.com/e081605169d6f3c605d52050a3a13522a473daf6/ui/app_list/views/page_switcher_vertical.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/997174a8a84df91727a37259fb5ee7ea6ee7e1a2

commit 997174a8a84df91727a37259fb5ee7ea6ee7e1a2
Author: weidongg <weidongg@chromium.org>
Date: Wed Jun 14 20:20:05 2017

Add new style to page switcher

1. Change button from slim rectangle to circle.
2. Apply different effect when the corresponding page of the button
   is selected.
3. Add ink drop ripple and highlight to the button, which are shown when clicked.

- screenshot:
https://screenshot.googleplex.com/jd3w9v2q5xm

BUG= 732067 

Review-Url: https://codereview.chromium.org/2942523002
Cr-Commit-Position: refs/heads/master@{#479487}

[modify] https://crrev.com/997174a8a84df91727a37259fb5ee7ea6ee7e1a2/ui/app_list/views/page_switcher_vertical.cc
[modify] https://crrev.com/997174a8a84df91727a37259fb5ee7ea6ee7e1a2/ui/app_list/views/page_switcher_vertical.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4b7bd924b5d4c938a1df51270fa7bd74e632f66a

commit 4b7bd924b5d4c938a1df51270fa7bd74e632f66a
Author: weidongg <weidongg@chromium.org>
Date: Thu Jun 15 21:09:37 2017

Remove redundant IsFullscreenAppListEnabled()

Call featuers::IsFullscreenAppListEnabled() once and cache it.

This is a follow up CL for issue 2938563002.

BUG= 732067 
TEST="Add --enable-features=EnableFullscreenAppList to see the changes"

Review-Url: https://codereview.chromium.org/2938953003
Cr-Commit-Position: refs/heads/master@{#479829}

[modify] https://crrev.com/4b7bd924b5d4c938a1df51270fa7bd74e632f66a/ui/app_list/views/apps_grid_view.cc
[modify] https://crrev.com/4b7bd924b5d4c938a1df51270fa7bd74e632f66a/ui/app_list/views/apps_grid_view.h

@newcomer, is the behavior of the page switcher as intended and can I mark this as fixed?