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This is to allow R8 to proguard and dex in one call, since it has some
optimizations that only work when doing everything in one shot.

Bug: 872904
Change-Id: Id2c75dac4d9feecae461a0b1e279056253f1b71b
Reviewed-on: https://chromium-review.googlesource.com/c/1227142Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597257}