Connect FalsingManager to HistoryTracker.

With this change, the analysis of gestures actually gets added to our
HistoryTracker. Prior to this, HistoryTracker was only ever being
exercised in tests.

The one trick that this addresses is that invalid single-taps can't
immediately be added to the HistoryTracker, as they may become
_valid_ double taps. We don't want double taps to be penalized.

Bug: 172655679
Test: atest SystemUITests
Change-Id: I2e5ece6af82eb20f053b6b17298dcd9002236e39