benchmarkIncrementalStart: Pass realistic user-agent so that deferrable legacy bundle build time isn't included in measurement
benchmarkIncrementalStart: Pass realistic user-agent so that deferrable legacy bundle build time isn't included in measurement

Discordius/Telescope,Discordius/Lesswrong2,Discordius/Lesswrong2,Discordius/Telescope,Discordius/Lesswrong2,Discordius/Lesswrong2,Discordius/Telescope,Discordius/Telescope