Ensure map_single_trace reports all exceptions as failures.
Ensure map_single_trace reports all exceptions as failures.

BUG=#1241

Review URL: https://codereview.chromium.org/1288273002

SummerLW/Perf-Insight-Report,zeptonaut/catapult,scottmcmaster/catapult,scottmcmaster/catapult,sahiljain/catapult,catapult-project/catapult,sahiljain/catapult,scottmcmaster/catapult,catapult-project/catapult-csm,benschmaus/catapult,modulexcite/catapult,sahiljain/catapult,zeptonaut/catapult,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,modulexcite/catapult,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,SummerLW/Perf-Insight-Report,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,0x90sled/catapult,catapult-project/catapult-csm,0x90sled/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult-csm,sahiljain/catapult,benschmaus/catapult,modulexcite/catapult,0x90sled/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,zeptonaut/catapult