Add a framework service tracking VR mode state.

- Implement a "VR mode" that may be enabled by a focused Activity.
- Add a system service that tracks the current VR mode state and notifies
  other core framework services of mode changes.
- Extend NotificationListenerService to allow the bind/unbind lifecycle
  of specified listeners to be triggered by system events.

Bug: 22855417
Bug: 25479708

Change-Id: I1ac8692bbb5521bb6c7cfb9d2b56b98b720f8568
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index fb5f21a..3db8376 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -89,14 +89,13 @@
 import com.android.server.tv.TvInputManagerService;
 import com.android.server.twilight.TwilightService;
 import com.android.server.usage.UsageStatsService;
-import com.android.server.usb.UsbService;
+import com.android.server.vr.VrManagerService;
 import com.android.server.wallpaper.WallpaperManagerService;
 import com.android.server.webkit.WebViewUpdateService;
 import com.android.server.wm.WindowManagerService;
 
 import dalvik.system.VMRuntime;
 
-import java.io.File;
 import java.util.Locale;
 import java.util.Timer;
 import java.util.TimerTask;
@@ -447,6 +446,7 @@
         ConsumerIrService consumerIr = null;
         MmsServiceBroker mmsService = null;
         EntropyMixer entropyMixer = null;
+        VrManagerService vrManagerService = null;
 
         boolean disableStorage = SystemProperties.getBoolean("config.disable_storage", false);
         boolean disableBluetooth = SystemProperties.getBoolean("config.disable_bluetooth", false);
@@ -532,6 +532,10 @@
             ServiceManager.addService(Context.INPUT_SERVICE, inputManager);
             Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
 
+            traceBeginAndSlog("StartVrManagerService");
+            mSystemServiceManager.startService(VrManagerService.class);
+            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
+
             mActivityManagerService.setWindowManager(wm);
 
             inputManager.setWindowManagerCallbacks(wm.getInputMonitor());