Automatically generate CLs for legacy guard flags

For example, a single command

 $ python add_legacy_flag.py SK_SUPPORT_LEGACY_AA_CHOICE -a /data/android -c ~/chromium/src -g legacyflag

generates the following CLs

 * http://cl/172474970
 * https://chromium-review.googlesource.com/c/chromium/src/+/725820
 * https://googleplex-android-review.git.corp.google.com/#/c/platform/external/skia/+/3088783/


Bug: skia:
Change-Id: Ie9a875f19ac86e0de83a8962ab384b10f8085c17
Reviewed-on: https://skia-review.googlesource.com/61400
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
2 files changed