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This CL also introduces a wrapped tracker object
that can proxy calls from C++ over to Java, which
allows the test to cover the IPH functionality from
end to end (including showing the IPH and making
sure the events to suppress it finds its way to the
Java test).

Bug: 1135551
Change-Id: I9e6a76a5a116aed6a6ca2047f01d7e32ee01f291
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468120
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818300}