So that users can generate slightly different AVD. A few use cases are:
* Different storage size for swarming and local AVDs.
* Portrait and landscape screen for tablet testing.
The "list" command is upgraded to be able to show the variants in json
file, so that the builder "android-avd-packager" can call and generate
variants programmatically.
Change-Id: I50c2827818666cc675a6a5b1e6fc5b5a0111a3ce
Bug: 364943269
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5909883
Commit-Queue: Haiyang Pan <hypan@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1367121}
7783e31cb5