Test Runner: Disable watchdog when debugger attached.
Test Runner: Disable watchdog when debugger attached.

Bug: angleproject:3162
Change-Id: I3685a4fe068b6e82b8bb04448c212788f563ab8b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2483463
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle