Add a data source field for volumes.

chrome/common/extensions/api/file_manager_private.idl

Index: chrome/common/extensions/api/file_manager_private.idl
diff --git a/chrome/common/extensions/api/file_manager_private.idl b/chrome/common/extensions/api/file_manager_private.idl
index 398c8f8143551a6db44e4087858ae5d99a6d3ab9..3230e1559d43f3996f78d8d7b52fdd8c4d5213e8 100644
--- a/chrome/common/extensions/api/file_manager_private.idl
+++ b/chrome/common/extensions/api/file_manager_private.idl
@@ -173,6 +173,13 @@ enum EntryTagVisibility {
   public
 };
 
+// Source of the volume data. Keep in sync with file_system_provider.idl.
+enum VolumeSource {
+  file,
+  device,
+  network
+};
+
 // 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
@@ -280,12 +287,15 @@ dictionary VolumeMetadata {
   // ID of the disk volume.
   DOMString volumeId;
 
-  // Id the provided file system (for proviided file systems).
+  // 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;