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Each bundle wrapper script now supports the new --build-mode=MODE
parameter for its 'build-bundle-apks' command. This is used to
specify the type of APKs archive to generate.

This allows generating APKS containing a system image APK, or
even a compressed systetm image APK and its installation stub.

Note that '--universal' is no longer supported, use
'--build-mode=universal' instead for the same result.

+ Add the build mode to the MD5 input strings, to ensure that
  the bundle is properly rebuilt if the mode changes. This didn't
  work previously when switching between default and universal
  builds.

BUG=NONE
R=agrieve@chromium.org, tiborg@chromium.org, benmason@chromium.org

Change-Id: Iddc6925e01ca849ffde6f6b43a902d9fd29401d2
Reviewed-on: https://chromium-review.googlesource.com/c/1489233
Commit-Queue: David Turner <digit@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635546}