tree c91a81ea359e0684dc2a0c3698903e35cf07db18
parent 530e6b576ce5c77654c8e69916b196948ba656cb
author Sanjay Chouksey <sanjayc@google.com> 1580774643 -0800
committer Sanjay Chouksey <sanjayc@google.com> 1580774643 -0800

[ermine] Set flutter_driver_extendable using build arg.

Set the flutter driver enabling flag from a build argument instead
of hardcoding it. In debug build, flutter driver is enabled, but it
does not allow the app using it to consume keyboard input unless it
is coming from test scripts. This change allows using the app using
real keyboard input during development. To test using flutter driver
please set:
  fx set workstation.x64 --args=flutter_driver_enabled=true

Change-Id: Ic12515b00cf1127b8987c933ad11065a68cd98cc