Add comments about sequence for setting parameters

        friend class RecordTrack;

                    const type_t            mType;

                    // Used by parameters, config events, addTrack_l, exit

                    Condition               mWaitWorkCV;

                    const sp<AudioFlinger>  mAudioFlinger;

                    uint32_t                mSampleRate;

                    size_t                  mFrameCount;

                    uint16_t                mChannelCount;

                    size_t                  mFrameSize;

                    audio_format_t          mFormat;

                    // Parameter sequence by client: binder thread calling setParameters():

                    //  1. Lock mLock

                    //  2. Append to mNewParameters

                    //  3. mWaitWorkCV.signal

                    //  4. mParamCond.waitRelative with timeout

                    //  5. read mParamStatus

                    //  6. mWaitWorkCV.signal

                    //  7. Unlock

                    //

                    // Parameter sequence by server: threadLoop calling checkForNewParameters_l():

                    // 1. Lock mLock

                    // 2. If there is an entry in mNewParameters proceed ...

                    // 2. Read first entry in mNewParameters

                    // 3. Process

                    // 4. Remove first entry from mNewParameters

                    // 5. Set mParamStatus

                    // 6. mParamCond.signal

                    // 7. mWaitWorkCV.wait with timeout (this is to avoid overwriting mParamStatus)

                    // 8. Unlock

                    Condition               mParamCond;

                    Vector<String8>         mNewParameters;

                    status_t                mParamStatus;

                    Vector<ConfigEvent>     mConfigEvents;

                    bool                    mStandby;

                    const audio_io_handle_t mId;