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This CL adds a telemetry benchmark which detects renderer memory leaks over page navigation.
The plan is to run this telemetry benchmark on FYI bot and eventually move it to CQ.
This is a part of Real-world Leak Detector project. (Design doc: https://docs.google.com/document/d/1wUWa7dWUdvr6dLdYHFfMQdnvgzt7lrrvzYfpAK-_6e0/edit?ts=5976c2d3&pli=1#)


Bug: 763280
Change-Id: I51223b7fdfc6d56830315317a70b2a2ddcc1d78e
Reviewed-on: https://chromium-review.googlesource.com/663001
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#516646}