Make sure adb shell input keyevent --longpress KEYCODE_DPAD_CENTER triggers...

Make sure adb shell input keyevent --longpress KEYCODE_DPAD_CENTER triggers View#performLongClick(...)

KeyEvent#ACTION_UP removes the CheckForLongPress callback
that triggers View#performLongClick(...) after the longpress
timeout. By adding a delay in case of a long press, the
View#CheckForLongPress callback runs as expected and the
long press is triggered.

Bug: 194799728
Test: manual; build ohm_gtv-userdebug and flash it; navigate to movie / app on main view of LauncherX; adb shell input keyevent --longpress KEYCODE_DPAD_CENTER; verify that longpress menu opens; adb shell input keyevent KEYCODE_DPAD_CENTER; verify that entity page opens
Change-Id: Iae08a6c3b2c52888eae63c91a609f4aff06d2297