Fix ContextMenuTest and RenameUiTest on Angler.

When doing consecutive selections, due the fact we are using
GestureDetector, consecutive selections that happen too close to each
other can result it being recognized as double-clicking. By making sure
"1 selected" appears first, we can wait a bit longer to make sure
onSingleTapConfirmed() gets called in the code as opposed to
onDoubleTap().

Bug: 31568862
Change-Id: I639b1854766d1a338b3ab397a4e6309885dba5a9