tree 3d6390525f4286e311ce9feec3e46de63db96154
parent 64ceace44f7a76d6b459edf4bfe42818b6825b4b
author Tianjie Xu <xunchang@google.com> 1540323614 -0700
committer Tianjie Xu <xunchang@google.com> 1540836096 -0700

Switch to use commandline parser

The commandline parser adds some flexibility to the argument parsing. It
also makes the help message more descriptive.

Bug: 74397117
Test: generate a image, checks the help message
Change-Id: Ib238658a9a6fa8806f1b0dde419c8fb970e7cb37