GitLab

Changes:
1. Initializes the search result page view using the same bounds, color
and background border corner raidus as the search box view to make it
hidden.

2. When there's query in the search box, grows the search result page in
the same pace as the search box to make them look like a single growing
view.

Screenshots of animation:
https://screenshot.googleplex.com/FNsJ0bE9s29
https://screenshot.googleplex.com/4ObTEsitpRK
https://screenshot.googleplex.com/sHQWVWaqavH
https://screenshot.googleplex.com/HVFKUXrYQhO

Specs: https://screenshot.googleplex.com/409fBM7pTO2

BUG=741051

Change-Id: I2fc15631e6675169dcb0ab222ce1af4cdc9cf2d2
Reviewed-on: https://chromium-review.googlesource.com/570835
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486825}