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Original CL got reverted because the num of landmarks aren't updated in services
tests that aren't checked on GPU FYI.

This is a reland of 5e1aa79b

Original change's description:
> ShapeDetection: Parse landmarks of the detected face on Mac Vision
>
> Update the mojom interface definition of landmark to match the Spec, and adjust
> the usage in services/blink/LayoutTests.
> Export eyes and mouth landmarks that detect with Mac Vision Framework, the points
> are normalized to the bounding box of the detected face, with the origin at the
> bounding box of the detected face's lower-left corner.
>
> Link Mac 10.13 build bots [1] and Face Detection demo[2] here.
>
> [1] https://ci.chromium.org/buildbot/chromium.fyi/Chromium%20Mac%2010.13/
> [2] https://codepen.io/miguelao/pen/PmJWro
>
> BUG=799319
>
> Cq-Include-Trybots: luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win10_chromium_x64_rel_ng
> Change-Id: Id034721a517e4ab2a6b9aa0e3eec9d10997b5b80
> Reviewed-on: https://chromium-review.googlesource.com/982579
> Reviewed-by: Miguel Casas <mcasas@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Commit-Queue: Junwei Fu <junwei.fu@intel.com>
> Cr-Commit-Position: refs/heads/master@{#552217}

TBR=mark@chromium.org

Bug: 799319
Change-Id: Id521f2a92dd3e1c6d8ac29d571bc1c58cfdb020e
Cq-Include-Trybots: luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win10_chromium_x64_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1023181
Commit-Queue: Junwei Fu <junwei.fu@intel.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552924}