Let InputDispatcher wake quickly when we ready stop process pending key

When we already intend to send down the pending key event to the
current focus window, we should make sure it can be done immediately.

Bug:none
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST

Signed-off-by: Linnan Li <lilinnan@xiaomi.corp-partner.google.com>
(cherry picked from https://partner-android-review.googlesource.com/q/commit:f1ab9a7e53993893ecd8a5af68eb669a9bf22e8a)
Merged-In: I4a96a6f30e803002b1592e49870334b6c3a416f7
Change-Id: I4a96a6f30e803002b1592e49870334b6c3a416f7