audio flinger: do not call JAVA services until system is ready

Wait for system ready indication form AudioService before enabling
calls to scheduling service or power manager.

Bug: 11520969.
Change-Id: I221927394f4a08fd86c9d457e55dd0e07949f0cf
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 51b2610..73590ae 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -257,6 +257,9 @@
     /* Get the HW synchronization source used for an audio session */
     virtual audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId);
 
+    /* Indicate JAVA services are ready (scheduling, power management ...) */
+    virtual status_t systemReady();
+
     virtual     status_t    onTransact(
                                 uint32_t code,
                                 const Parcel& data,
@@ -752,6 +755,7 @@
 
     uint32_t    mPrimaryOutputSampleRate;   // sample rate of the primary output, or zero if none
                                             // protected by mHardwareLock
+    bool       mSystemReady;
 };
 
 #undef INCLUDING_FROM_AUDIOFLINGER_H