emulator: Add textpb files for avd creation

This is to decouple avd creation and installation

Also the versions of emulator and system image used for avd creation are
added to the created avd CIPD package.
This could provide helpful information when rolling new AVDs.

Bug: 922145
Change-Id: Ic7b855a0d13a3aee4a785bff1cd2dfc2b4b2c751
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2180112
Commit-Queue: Haiyang Pan <hypan@google.com>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#765632}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d921f52419ca7d6f55be5ecd8ef73fa05b69ea7c
5 files changed