Add logging for FLAG_SLIPPERY usage

We are interested to learn about the usage of FLAG_SLIPPERY. Do any apps
use it? Or is it only used by system components?

If apps aren't using it, let's lock it down.

Bug: 157929241
Test: adb shell dumpsys platform_compat
Change-Id: I73130ebe86ea66906cd8f281785dc6aced1ce03f
diff --git a/services/inputflinger/benchmarks/Android.bp b/services/inputflinger/benchmarks/Android.bp
index 9abf8b1..bd275a7 100644
--- a/services/inputflinger/benchmarks/Android.bp
+++ b/services/inputflinger/benchmarks/Android.bp
@@ -16,6 +16,7 @@
         "libstatslog",
         "libui",
         "libutils",
+        "lib-platform-compat-native-api",
     ],
     static_libs: [
         "libattestation",