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The data is then send back to browser process.

This CL only adds mojo links. No data actually collected.

Bug: 1039792
Change-Id: I11b1cb9876ebaff2b5fe164db476549e682412e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031857Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738576}