Prevent Log.wtf crash in benign case

Fixes a crash that happens when you turn of the screen
while moving the finger. Some touches still come in even
when the screen went to sleep. No need to get upset over
those.

Bug: 27595423
Change-Id: If75ae3b6c2c83a87f38daaf8777f89d8c74a9cd1
diff --git a/packages/SystemUI/src/com/android/systemui/classifier/FalsingManager.java b/packages/SystemUI/src/com/android/systemui/classifier/FalsingManager.java
index 937f7d3..0d822cb 100644
--- a/packages/SystemUI/src/com/android/systemui/classifier/FalsingManager.java
+++ b/packages/SystemUI/src/com/android/systemui/classifier/FalsingManager.java
@@ -166,7 +166,9 @@
      */
     public boolean isFalseTouch() {
         if (FalsingLog.ENABLED) {
-            if (!mSessionActive) {
+            // We're getting some false wtfs from touches that happen after the device went
+            // to sleep. Only report missing sessions that happen when the device is interactive.
+            if (!mSessionActive && mContext.getSystemService(PowerManager.class).isInteractive()) {
                 FalsingLog.wtf("isFalseTouch", new StringBuilder()
                         .append("Session is not active, yet there's a query for a false touch.")
                         .append(" enabled=").append(isEnabled() ? 1 : 0)