IME's requested visibility considers tooltype

IME requested visibility should consider the toolType used to focus the
editor. If tool type was stylus, we should not request to show virtual
keyboard.

By not requesting virtual keyboard (no call to onStartInputView), IME can avoid redundant
draw for keyboard views and hence reduce the initiation latency.

Bug: 287109569
Test: atest StylusHandwritingTest

Change-Id: I0f74f8de59cf3f530ede43243ed820d4bee8199b