Declare providing extension capabilities in the manifest.

chrome/common/extensions/api/file_manager_private.idl

 // Copyright 2013 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.
 
 // fileManagerPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_manager_private_api_functions.h"]
 namespace fileManagerPrivate {
 // Type of the mounted volume.
@@ skipping 155 matching lines @@
   shared,
   externalFileUrl
 };
 
 // Entry property visibility for setEntryTag();
 enum EntryTagVisibility {
   private,
   public
 };
 
-// Source of the volume data.
-enum VolumeSource {
-  // Represents a mounted file. In most cases, simply an archive.
-  file,
-
-  // Representing a device, eg. an MTP device. Also, used for Downloads as it's
-  // containing files stored on the Chrome OS device.
-  device,
-
-  // Used for volumes which contain files on a remote machine, eg. Drive or
-  // cloud services implemented via the File System Provider API.
-  network
-};
+// Source of provided file system's data. See Provided File System API docs for
+// details.
+enum Source { file, device, network };

[not at google - send to devlin, 2015/04/23 23:16:35]

When https://codereview.chromium.org/1100333006/ goes in you'll be able to
directly reference the other file and not need to declare this enum at all,
i.e., below where you have:

// Source of file systems' data.
Source source;

you should be able to have:

// Source of the file system's data.
fileSystemProvider.Source source;

[mtomasz, 2015/04/24 12:16:10]

Done.

 
 // A file task represents an action that the file manager can perform over the
 // currently selected files. See
 // chrome/browser/chromeos/extensions/file_manager/file_tasks.h for details
 // about how file tasks are handled.
 dictionary FileTask {
   // The unique identifier of the task.
   DOMString taskId;
 
   // Task title (ex. App name).
@@ skipping 94 matching lines @@
 dictionary VolumeMetadata {
   // ID of the disk volume.
   DOMString volumeId;
 
   // Id the provided file system (for provided file systems).
   DOMString? fileSystemId;
 
   // Extension providing this volume (for provided file systems).
   DOMString? extensionId;
 
-  // Source of the volume data.
-  VolumeSource? volumeSource;
-
   // Label of the volume (if available).
   DOMString? volumeLabel;
 
   // Description of the profile where the volume belongs.
   // TODO(hirono): Remove the property because of the design change of
   // multi-profile support.
   ProfileInfo profile;
 
   // The path to the mounted device, archive file or network resource.
   DOMString? sourcePath;
@@ skipping 204 matching lines @@
 
 // Describes an installed providing extension.
 dictionary ProvidingExtension {
   // ID of the providing extension.
   DOMString extensionId;
 
   // Name of the providing extension.
   DOMString name;
 
   // Whether supports configuration dialog.
-  boolean canConfigure;
+  boolean configurable;
 
-  // Whether supports adding new instances.
-  boolean canAdd;
+  // Whether supports mounting multiple instances.
+  boolean multipleMounts;
+
+  // Source of file systems' data.
+  Source source;
 };
 
 // Callback that does not take arguments.
 callback SimpleCallback = void();
 
 // |result| Boolean result returned by the invoked function.
 callback BooleanCallback = void(boolean result);
 
 // |result| Result of the task execution.
 callback ExecuteTaskCallback = void(TaskResult result);
@@ skipping 388 matching lines @@
 
   static void onPreferencesChanged();
 
   static void onDriveConnectionStatusChanged();
 
   static void onDeviceChanged(DeviceEvent event);
 
   static void onDriveSyncError(DriveSyncErrorEvent event);
 };
 };