MediaRecorderClient: Use checkService instead of getService for camera am: 58aef303

    mRecorder->setListener(listener);

    sp<IServiceManager> sm = defaultServiceManager();

    sp<IBinder> binder = sm->getService(String16("media.camera"));

    // WORKAROUND: We don't know if camera exists here and getService might block for 5 seconds.

    // Use checkService for camera if we don't know it exists.

    static std::atomic<bool> sCameraChecked(false);  // once true never becomes false.

    static std::atomic<bool> sCameraVerified(false); // once true never becomes false.

    sp<IBinder> binder = (sCameraVerified || !sCameraChecked)

        ? sm->getService(String16("media.camera")) : sm->checkService(String16("media.camera"));

    // If the device does not have a camera, do not create a death listener for it.

    if (binder != NULL) {

        sCameraVerified = true;

        mCameraDeathListener = new ServiceDeathNotifier(binder, listener,

                MediaPlayerService::CAMERA_PROCESS_DEATH);

        binder->linkToDeath(mCameraDeathListener);

    }

    sCameraChecked = true;

    binder = sm->getService(String16("media.codec"));

    mCodecDeathListener = new ServiceDeathNotifier(binder, listener,