tree 5936fd4d31349a1e0ca3a9fadf0c70eb4f515b21
parent aabadc576fb6dd4e44e214ae6fa7a09927602a4b
author Yuli Huang <yuli@chromium.org> 1547803852 +0800
committer yuli <yuli@chromium.org> 1548057910 +0000

Revise button disabling and use no-op if applicable.

BUG=None
TEST=Tested by switching modes/devices.

Change-Id: Ic54ddae4d8ae1d732b429a333287aa378089020b
Reviewed-on: https://chromium-review.googlesource.com/c/1420521
Reviewed-by: Shik Chen <shik@chromium.org>
Tested-by: yuli <yuli@chromium.org>