DO NOT MERGE Check caller for sending media key to global priority session

import android.os.IBinder;

import android.os.Message;

import android.os.PowerManager;

import android.os.Process;

import android.os.RemoteException;

import android.os.ResultReceiver;

import android.os.ServiceManager;

                            + "setup is in progress.");

                    return;

                }

                if (isGlobalPriorityActive() && uid != Process.SYSTEM_UID) {

                    // Prevent dispatching key event through reflection while the global priority

                    // session is active.

                    Slog.i(TAG, "Only the system can dispatch media key event "

                            + "to the global priority session.");

                    return;

                }

                synchronized (mLock) {

                    // If we don't have a media button receiver to fall back on