skia_android_serial = "auto"

Handy if you only have one device plugged in at a time.

Note that when used, this makes GN treat all devices' serial numbers as "auto", so it won't re-push if you swap devices until you change the binary that's being pushed.

Change-Id: I1f72133d6d8c4b5569734f191d414088e0b41f06
Reviewed-on: https://skia-review.googlesource.com/6948
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
diff --git a/gn/push_to_android.py b/gn/push_to_android.py
index b9ab36f..694439b 100755
--- a/gn/push_to_android.py
+++ b/gn/push_to_android.py
@@ -12,9 +12,11 @@
 host, serial, stamp = sys.argv[1:]
 device = '/data/local/tmp/' + os.path.basename(host)
 
+restrict = [] if serial == 'auto' else ['-s', serial]
+
 # adb push is verbose, so eat its output with check_output().
-subprocess.check_output(['adb', '-s', serial, 'push', host, device])
-subprocess.check_call(['adb', '-s', serial, 'shell', 'chmod', '+x', device])
+subprocess.check_output(['adb'] + restrict + ['push', host, device])
+subprocess.check_call(['adb'] + restrict + ['shell', 'chmod', '+x', device])
 
 # Touch a file to let GN/Ninja know we succeeded.
 with open(stamp, 'w'):