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Add a TabModelSelectorTabObserver for IPH_TabGroupsQuicklyComparePages
and plumb SearchableFormURL to Java NavigationHandle.

TBR=michaelbai@chromium.org

Bug: 930970
Change-Id: I857d0119ebc7ffc0bdcf09373696d8970556815f
Reviewed-on: https://chromium-review.googlesource.com/c/1492933
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636692}