systemui may crash due
to an uninitialized value of mNavigationBar probably because
of some race condition during initialization caused by emulation
performance issues:
11-01 19:48:58.634 5064 5064 E AndroidRuntime: FATAL EXCEPTION: main
11-01 19:48:58.634 5064 5064 E AndroidRuntime: Process: com.android.systemui, PID: 5064
11-01 19:48:58.634 5064 5064 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.android.systemui.statusbar.phone.LightBarTransitionsController.dump (java.io.FileDescriptor, java.io.PrintWriter, java.lang.String[])' on a null object reference
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.systemui.statusbar.phone.LightBarController.dump(LightBarController.java:241)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.systemui.statusbar.phone.StatusBar.dump(StatusBar.java:3448)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.systemui.SystemBars.dump(SystemBars.java:48)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.systemui.SystemUIService.dump(SystemUIService.java:52)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.app.ActivityThread.handleDumpService(ActivityThread.java:3488)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.app.ActivityThread.-wrap9(Unknown Source:0)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.app.ActivityThread.handleMessage(ActivityThread.java:1726)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:105)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.os.Looper.loop(Looper.java:164)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6541)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.internal.os.Zygote.run(Zygote.java:240)
11-01 19:48:58.634 5064 5064 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
This patches adds an explicit checks for (mNavigationBar != null)
everywhere it is used.
Test: cts test.
Change-Id: I8056aef54a10bbb1970bc2ce4913e7a618498fd3
2aa5a9df8a