B2G now building using unified sources

Last week, with the help of Ehsan and John, we finally enabled unified source builds for B2G devices.

As a result we're building device builds approximately 40% faster than before.

Between June 12th and June 17th, 50% of our successful JB emulator builds on mozilla-inbound finished in 97 minutes or less. Using unified sources for these builds reduced the 50th percentile of build times down to 60 minutes (from June 19th to June 24th).

To mitigate the risks of changes landing that break non-unified builds, we're also doing periodic non-unified builds for these devices.

As usual, all our work here was done in the open. If you're interested, read along in bug 950676, and bug 942167.

Do you enjoy building, debugging and optimizing build, test & release pipelines? Great, because we're hiring!

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