[NaCl SDK] Add HTTP mount.

native_client_sdk/src/libraries/nacl_mounts/nacl_mounts.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef LIBRARIES_NACL_MOUNTS_NACL_MOUNTS_H_
 #define LIBRARIES_NACL_MOUNTS_NACL_MOUNTS_H_
 
 #include <ppapi/c/pp_instance.h>
 #include <ppapi/c/ppb.h>
 
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  *              read in JavaScript via the HTML5 FileSystem API. This mount
  *              provides the use of persistent storage. Please read the
  *              documentation in ppapi/c/ppb_file_system.h for more information.
  *     source: Unused.
  *     data: A string of parameters:
  *       "type": Which type of filesystem to mount. Valid values are
  *           "PERSISTENT" and "TEMPORARY". The default is "PERSISTENT".
  *       "expected_size": The expected file-system size. Note that this does
  *           not request quota -- you must do that from JavaScript.
  *
+ *   "httpfs": A filesystem that reads from a URL via HTTP.
+ *     source: The root URL to read from. All paths read from this filesystem
+ *             will be appended to this root.
+ *             e.g. If source == "http://example.com/path", reading from
+ *             "foo/bar.txt" will attempt to read from the URL
+ *             "http://example.com/path/foo/bar.txt".
+ *     data: A string of parameters:
+ *       "allow_cross_origin_request": If "true", then reads from this
+ *           filesystem will follow the CORS standard for cross-origin requests.
+ *           See http://www.w3.org/TR/access-control.
+ *       "allow_credentials": If "true", credentials are sent with cross-origin
+ *           requests. If false, no credentials are sent with the request and
+ *           cookies are ignored in the response.
+ *       All other key/value pairs are assumed to be headers to use with
+ *       HTTP requests.
+ *
  *
  * @param[in] source Depends on the filesystem type. See above.
  * @param[in] target The absolute path to mount the filesystem.
  * @param[in] filesystemtype The name of the filesystem type to mount. See
  *     above for examples.
  * @param[in] mountflags Unused.
  * @param[in] data Depends on the filesystem type. See above.
  * @return 0 on success, -1 on failure (with errno set).
  */
 int mount(const char* source, const char* target, const char* filesystemtype,
           unsigned long mountflags, const void *data) NOTHROW;
 
 EXTERN_C_END
 
 #endif  // LIBRARIES_NACL_MOUNTS_NACL_MOUNTS_H_