Making it clear that a test sees the keyguard for the first time.

This help to find a test which bugreport may still contain a recent crash in SysUI. This is the tests that prints "for the first time = true"

Test: presubmit
Bug: 187761685
Change-Id: Ic24a1d6f4ba36e117df2166c57bbc0a1d021cc7d

tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java

@@ -240,11 +240,16 @@ public abstract class AbstractLauncherUiTest {
     public void setUp() throws Exception {
         mLauncher.onTestStart();
 
+        final boolean keyguardAlreadyVisible = sSeenKeygard;
+
         sSeenKeygard = sSeenKeygard
                 || !TestHelpers.wait(
                 Until.gone(By.res(SYSTEMUI_PACKAGE, "keyguard_status_view")), 60000);
 
-        Assert.assertFalse("Keyguard is visible, which is likely caused by a crash in SysUI",
+        Assert.assertFalse(
+                "Keyguard is visible, which is likely caused by a crash in SysUI, seeing keyguard"
+                        + " for the first time = "
+                        + !keyguardAlreadyVisible,
                 sSeenKeygard);
 
         final String launcherPackageName = mDevice.getLauncherPackageName();