Our current fence wait time is triggering timeouts while running with
SwiftShader. However, it's possible for a 'real' application to hit a
timeout also with a large enough workload. This change increases the
timeout to something large enough for us to avoid most timeouts and
instead rely on the OS's detection and recovery mechanism (e.g., Windows
TDR).

We will continue to investigate improving ANGLE's command timeout
handling mechanism.

Bug: angleproject:4043
Test: CQ
Change-Id: I3a32174d1d794806fef1971806797683b6b3f0b2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1897648
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>