FrameCapture: Skip output dir check if disabled * In order to improve performance and avoid errors when running with capture support, change the output dir checks to be optional. * The checks are expensive on Android due to reading the process name and filesystem locations. * We want want to continue emitting errors if the user wants to capture but didn't create the output dir. Test: Android apps with and without capture enabled via properties Bug: b/296397568 Change-Id: If3adbe0c569db49fd8e8e430b7c57ae8585ca4d7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4854443 Reviewed-by: Roman Lavrov <romanl@google.com> Commit-Queue: Cody Northrop <cnorthrop@google.com>