Remove tmp directory after CompilationCachingTest if cache not supported. am: 6824cc1e

        NeuralnetworksHidlTest::SetUp();

        ASSERT_NE(device.get(), nullptr);

        // Create cache directory.

        // Create cache directory. The cache directory and cache files are always created to test

        // the behavior of prepareModelFromCache, even when caching is not supported.

        char cacheDirTemp[] = "/data/local/tmp/TestCompilationCachingXXXXXX";

        char* cacheDir = mkdtemp(cacheDirTemp);

        ASSERT_NE(cacheDir, nullptr);

        mCache1 = cacheDir + mCache1;

        mCache2 = cacheDir + mCache2;

        mCache3 = cacheDir + mCache3;

        mCacheDir = cacheDir;

        // Create empty cache files.

        mCache1 = mCacheDir + "/cache1";

        mCache2 = mCacheDir + "/cache2";

        mCache3 = mCacheDir + "/cache3";

        // A dummy handle, use AccessMode::WRITE_ONLY for createCacheHandle to create files.

        hidl_handle handle;

        createCacheHandle({mCache1, mCache2, mCache3}, AccessMode::WRITE_ONLY, &handle);

        // Check if caching is supported.

        bool isCachingSupported;

                      << std::endl;

            mIsCachingSupported = false;

        }

    }

        // Create empty cache files.

        hidl_handle handle;

        createCacheHandle({mCache1, mCache2, mCache3}, AccessMode::WRITE_ONLY, &handle);

    void TearDown() override {

        // The tmp directory is only removed when the driver reports caching not supported,

        // otherwise it is kept for debugging purpose.

        if (!mIsCachingSupported) {

            remove(mCache1.c_str());

            remove(mCache2.c_str());

            remove(mCache3.c_str());

            rmdir(mCacheDir.c_str());

        }

        NeuralnetworksHidlTest::TearDown();

    }

    void saveModelToCache(sp<IPreparedModel> preparedModel, const hidl_handle& cache1,

                                 .withDefault(nullptr);

    }

    std::string mCache1 = "/cache1";

    std::string mCache2 = "/cache2";

    std::string mCache3 = "/cache3";

    std::string mCacheDir;

    std::string mCache1;

    std::string mCache2;

    std::string mCache3;

    uint8_t mToken[static_cast<uint32_t>(Constant::BYTE_SIZE_OF_CACHE_TOKEN)] = {};

    bool mIsCachingSupported;

};