Android: Filter out chatty ProGuard console output

Also refactors our proguard wrapper a bit by having it:
 * Ensure all outputs exist before short-circuiting
 * Only touch missing files after building (avoids creating 0-length
   files for a failed run).

Change-Id: Ie57a925a9258dd9c304e7af4bcccaf94b24b1129
Reviewed-on: https://chromium-review.googlesource.com/770790
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517490}

CrOS-Libchrome-Original-Commit: cfa1676925d1727f8c4ead91932fd12286db98dd
1 file changed
tree: 445229b9be125902656ed43a808cbff07da2a9c8
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/