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Adds a test for exercising Telemetry's hung renderer detection/crashing
code. If Telemetry detects a hung renderer, it should crash the hung
renderer process and the GPU process so that we can get minidumps to
diagnose the root cause.

Bug: 1119564
Change-Id: Ibf72a57af6396f7e3ad32fcc16f35d5cd7d1b657
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378761
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803200}