Add LightRevealScrim to dumpsys to rule it out as the cause of an elusive bug.

Bug: 193117756
Test: dump the sys
Change-Id: I64c0f0291f2f250a04ac71c1ccd662f0b2420dd7

packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

@@ -2737,6 +2737,11 @@ public class StatusBar extends SystemUI implements DemoMode,
             mScrimController.dump(fd, pw, args);
         }
 
+        if (mLightRevealScrim != null) {
+            pw.println(
+                    "mLightRevealScrim.getRevealAmount(): " + mLightRevealScrim.getRevealAmount());
+        }
+
         if (mStatusBarKeyguardViewManager != null) {
             mStatusBarKeyguardViewManager.dump(pw);
         }