Logs accessibility service user trigger status.

* Uses the atom AccessibilityServiceReported in westworld.

Bug: 151285965
Test: make statsd_testdrive && ./out/host/linux-x86/bin/statsd_testdrive 267
Change-Id: Id6a109e4e90c09f2310d92533cd4632875712f81

src/com/android/settings/accessibility/LaunchAccessibilityActivityPreferenceFragment.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.accessibility;
 
+import static com.android.settings.accessibility.AccessibilityStatsLogUtils.logServiceStatus;
+
 import android.accessibilityservice.AccessibilityShortcutInfo;
 import android.app.ActivityOptions;
 import android.content.ActivityNotFoundException;
@@ -55,6 +57,7 @@ public class LaunchAccessibilityActivityPreferenceFragment extends
 
     @Override
     protected void onPreferenceToggled(String preferenceKey, boolean enabled) {
+        logServiceStatus(mComponentName.flattenToString(), enabled);
         launchShortcutTargetActivity(getPrefContext().getDisplayId(), mComponentName);
     }