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Currently, Aura Overlay Scrollbar will fade out when user finding in the
page. This patch is to improve this UX.

In this patch, we check HasFindInPageTickmarks in root vertical Scrollbar Layer
then show and prevent it fadeout or post the hide animation the scrollbar at the
end of syncing pending tree to active tree.

After this, we will show Aura Overlay Scrollbar when user type the first
character in find in page box and post fade out animation when user
close find in page or delete last character in find in page box.

Bug: 759152
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Id2baf95a6441ffa58a09597dba6b0bed5299a1c3
Reviewed-on: https://chromium-review.googlesource.com/946744Reviewed-by: weiliangc <weiliangc@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542281}