Merge "Binder NDK tests: use std::mutex, not android::Mutex" into main

class MyResultReceiver : public BnResultReceiver {

   public:

    Mutex mMutex;

    Condition mCondition;

    std::mutex mMutex;

    std::condition_variable mCondition;

    bool mHaveResult = false;

    int32_t mResult = 0;

    virtual void send(int32_t resultCode) {

        AutoMutex _l(mMutex);

        std::unique_lock<std::mutex> _l(mMutex);

        mResult = resultCode;

        mHaveResult = true;

        mCondition.signal();

        mCondition.notify_one();

    }

    int32_t waitForResult() {

        AutoMutex _l(mMutex);

        std::unique_lock<std::mutex> _l(mMutex);

        while (!mHaveResult) {

            mCondition.wait(mMutex);

            mCondition.wait(_l);

        }

        return mResult;

    }