Android tests: raise if --render-test-output-dir doesn't exist For convenience when testing locally, otherwise we get an obscure error later on Bug: angleproject:370089935 Change-Id: I94f52aef90afb600baae45540e0e53f899554ee9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5960260 Auto-Submit: Roman Lavrov <romanl@google.com> Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Roman Lavrov <romanl@google.com> Commit-Queue: Amirali Abdolrashidi <abdolrashidi@google.com>