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Add a couple of investigative dumps to understand better where and how
a large number of LatencyInfo objects are accumulating.

BUG=834421

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ieea6e47c4a1acf5c89384048e19b742e3e21e5a8
Reviewed-on: https://chromium-review.googlesource.com/1054153Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557994}