Add getCacheDir() to RenamingDelegatingContext.

import android.content.ContextWrapper;

import android.content.ContentProvider;

import android.database.sqlite.SQLiteDatabase;

import android.os.FileUtils;

import android.util.Log;

import java.io.File;

import java.io.FileInputStream;

    private Context mFileContext;

    private String mFilePrefix = null;

    private File mCacheDir;

    private final Object mSync = new Object();

    private Set<String> mDatabaseNames = Sets.newHashSet();

    private Set<String> mFileNames = Sets.newHashSet();

        return mFileNames.toArray(new String[]{});

    }

    /**

     * In order to support calls to getCacheDir(), we create a temp cache dir (inside the real

     * one) and return it instead.  This code is basically getCacheDir(), except it uses the real

     * cache dir as the parent directory and creates a test cache dir inside that.

     */

    @Override

    public File getCacheDir() {

        synchronized (mSync) {

            if (mCacheDir == null) {

                mCacheDir = new File(mFileContext.getCacheDir(), renamedFileName("cache"));

            }

            if (!mCacheDir.exists()) {

                if(!mCacheDir.mkdirs()) {

                    Log.w("RenamingDelegatingContext", "Unable to create cache directory");

                    return null;

                }

                FileUtils.setPermissions(

                        mCacheDir.getPath(),

                        FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH,

                        -1, -1);

            }

        }

        return mCacheDir;

    }

//    /**

//     * Given an array of files returns only those whose names indicate that they belong to this

//     * context.