Create Input SlopController

Create a basic input slop controller, and use it for rotary inputs.

Bug: 285957835
Test: atest SlopControllerTest

Change-Id: I0cabfed1f064b849f8151f069e1241292cc374cf
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index 300bb85..370e971 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -59,6 +59,7 @@
         "NotifyArgs_test.cpp",
         "PreferStylusOverTouch_test.cpp",
         "PropertyProvider_test.cpp",
+        "SlopController_test.cpp",
         "SyncQueue_test.cpp",
         "TestInputListener.cpp",
         "TouchpadInputMapper_test.cpp",