Merge "Add more JSDoc about ErrnoException" into oc-dev

/**

 * Callback that handles file system requests from ProxyFileDescriptor.

 *

 * @see android.os.storage.StorageManager#openProxyFileDescriptor(int, ProxyFileDescriptorCallback)

 * All callback methods except for onRelease should throw {@link android.system.ErrnoException}

 * with proper errno on errors. See

 * <a href="http://man7.org/linux/man-pages/man3/errno.3.html">errno(3)</a> and

 * {@link android.system.OsConstants}.

 *

 * Typical errnos are

 *

 * <ul>

 * <li>{@link android.system.OsConstants#EIO} for general I/O issues

 * <li>{@link android.system.OsConstants#ENOENT} when the file is not found

 * <li>{@link android.system.OsConstants#EBADF} if the file doesn't allow read/write operations

 *     based on how it was opened.  (For example, trying to write a file that was opened read-only.)

 * <li>{@link android.system.OsConstants#ENOSPC} if you cannot handle a write operation to

 *     space/quota limitations.

 * </ul>

 * @see android.os.storage.StorageManager#openProxyFileDescriptor(int, ProxyFileDescriptorCallback,

 *     Handler)

 */

public abstract class ProxyFileDescriptorCallback {

    /**