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Changes:
1. Enlarges the width of the AppsGridView to make 24px horizontal
padding for page switcher.
2. In the meanwhile, keeps the AppsGridView horizontally centered by
adding equal space to left and right side.

Specs: https://screenshot.googleplex.com/vdLmFvaJSdR
Screenshot: https://screenshot.googleplex.com/SWec2Jeqhon

BUG=741007

Change-Id: If74cc65099385580b8955825febcd39526a05992
Reviewed-on: https://chromium-review.googlesource.com/578723
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Qiang(Joe) Xu <warx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488305}