Reland "Hook up AR hit-test to 3D ARCore hit-test API"

This is a reland of f61ad483f82729343b651972320333297110756a

Original CL got reverted due to dependency on CL to upgrade
ARCore SDK to version 1.5, which got reverted. Now that the ARCore SDK
is at version 1.5, we can reland this CL.

Original change's description:
> Hook up AR hit-test to 3D ARCore hit-test API
>
> Now that we can use ARCore SDK 1.5, we can start using 3D version of
> hit test and remove previously used one. Since we no longer use
> ArFrame_hitTest, it is getting removed from arcore_shim.cc.
>
> Bug: 835948, 854823
> Change-Id: Ibf8e953135b04925dbebd384e16f8f08ad52a869
> Reviewed-on: https://chromium-review.googlesource.com/c/1357723
> Reviewed-by: Klaus Weidner <klausw@chromium.org>
> Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#618649}

TBR=klausw@chromium.org

Bug: 835948, 854823
Change-Id: I99c2514b3a25a84884eae713205c6b3c34688b1e
Reviewed-on: https://chromium-review.googlesource.com/c/1399286
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620850}
8 files changed