The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/82a47597e79c96751e2cdd3ba3915018068aab7b

commit 82a47597e79c96751e2cdd3ba3915018068aab7b
Author: bsheedy <bsheedy@chromium.org>
Date: Tue Oct 31 22:29:01 2017

Make VR Telemetry tests navigate to blank page on finish

Re-lands a prior patch that made VR Telemetry tests exit VR and navigate
to a blank page after each story to reduce heat output, with a few
differences:

1. The issue that caused the original patch's revert has been fixed by
    cycling the device's screen off then on instead of just ensuring
    that it is on.
2. Instead of running JavaScript code to exit VR then navigate, we
    simply navigate away since there doesn't seem to be any impact to
    stability or results by navigating without first exiting VR.

Bug:  779837 
Change-Id: Ia030b52d2cb87026f073eda2e7d37209c0992dae
Reviewed-on: https://chromium-review.googlesource.com/747278
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#512980}
[modify] https://crrev.com/82a47597e79c96751e2cdd3ba3915018068aab7b/tools/perf/contrib/vr_benchmarks/shared_android_vr_page_state.py
[modify] https://crrev.com/82a47597e79c96751e2cdd3ba3915018068aab7b/tools/perf/contrib/vr_benchmarks/webvr_sample_pages.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e29eea14f91a8adb8ed3a443fb23eab673f2932b

commit e29eea14f91a8adb8ed3a443fb23eab673f2932b
Author: bsheedy <bsheedy@chromium.org>
Date: Sat Jan 20 01:14:09 2018

Add build targets for Devil arm deps

Adds build targets for arm versions of md5sum, host_forwarder, and
libc++. Special targets are necessary since the Android/device deps
can't be built with the clang_arm toolchain, so we can't just use it
for everything.

Also updates the arm build config slightly since Raspberry Pis require
mfloat-abi to be set to hard, while Android requires it to be set to
soft.

Bug:  779837 
Change-Id: I19c861d2c8a528c82bcb5d9f43c3812499d23ddf
Reviewed-on: https://chromium-review.googlesource.com/761357
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530711}
[modify] https://crrev.com/e29eea14f91a8adb8ed3a443fb23eab673f2932b/build/config/arm.gni
[modify] https://crrev.com/e29eea14f91a8adb8ed3a443fb23eab673f2932b/build/config/gcc/BUILD.gn
[modify] https://crrev.com/e29eea14f91a8adb8ed3a443fb23eab673f2932b/build/secondary/third_party/catapult/devil/BUILD.gn
[add] https://crrev.com/e29eea14f91a8adb8ed3a443fb23eab673f2932b/build/secondary/third_party/catapult/devil/devil_arm.gni

We've decided to use Intel NUCs instead of Raspberry Pis, since they're x86 and still relatively cheap, so we don't have to deal with arm issues. They're also significantly faster than the RPis.