Launch packaged app with files on Drive on Chrome OS.

webkit/fileapi/file_system_types.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 WEBKIT_FILEAPI_FILE_SYSTEM_TYPES_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_TYPES_H_
 
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFileSystem.h"
 
 namespace fileapi {
@@ skipping 57 matching lines @@
   // Indicates media filesystem to which we need special protocol to access,
   // such as MTP or PTP.
   kFileSystemTypeDeviceMedia,
 
   // Indicates a Drive filesystem which provides access to Google Drive.
   kFileSystemTypeDrive,
 
   // Indicates a Syncable sandboxed filesystem which can be backed by a
   // cloud storage service.
   kFileSystemTypeSyncable,
+
+  // Indicates an external filesystem but with file path is specified by
+  // a full path, rather than a relative path from a mount point.
+  kFileSystemTypeExternalFullPath,

[kinuko, 2013/03/19 20:34:50]

This filesystem type is being added not based on underlying implementation but
for higher-level mount point view.  Could we come up with a better name (and
better comment) to indicate the fact?  'ExternalFullPath' sounds too biased to
the chromeos usage to me.  How one can guess this could mean NativeLocal in
non-chromeos world?

The term 'Native' may feel better than 'External', since in ChromeOS 'native
path' might just mean the external filesystem path (I could be wrong). 
kFileSystemTypeNativeForPlatformApp?  May sound too restrictive?

...oh but it's handled in ExternalMountPoints, that's why you prefixed External.
 Maybe should we just use this type only for ChromeOS and remove the special
cracking using NativeLocal for non-chromeos?

[kinaba, 2013/03/21 07:35:13]

Changed to kFileSystemTypeNativeForPlatformApp.

Using the type only for ChromeOS is possible, but it means
the uses of RegisterFileSystemForPath in apps must be wrapped
with #ifdef OS_CHROMEOS, which doesn't seem clean and maintainable.

On 2013/03/19 20:34:50, kinuko wrote:

 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_TYPES_H_