Reland "Add hung renderer minidump test"

This is a reland of 252fed6f11640630b320bc26cac7f4a0af28a9f5

Changes from original CL:
* Adds an additional crash signature for the renderer process

Original change's description:
> Add hung renderer minidump test
>
> 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}

Bug: 1119564
Change-Id: Ieda25c053a170121b4878ceb23d66c03e0b2a189
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386490
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803680}