Add a data source field for volumes.

chrome/browser/chromeos/extensions/file_manager/private_api_util.cc

Index: chrome/browser/chromeos/extensions/file_manager/private_api_util.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_util.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_util.cc
index a220fe889ae00c1891a445372bb38789936b9d10..91581d0ab05d83865ed854d40a1f53e15a59a118 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_util.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_util.cc
@@ -182,9 +182,25 @@ void VolumeToVolumeMetadata(
         new std::string(volume.source_path().AsUTF8Unsafe()));
   }
 
+  switch (volume.volume_source()) {
+    case VOLUME_SOURCE_UNKNOWN:
+      volume_metadata->volume_source = file_manager_private::VOLUME_SOURCE_NONE;
+      break;
+    case VOLUME_SOURCE_FILE:
+      volume_metadata->volume_source = file_manager_private::VOLUME_SOURCE_FILE;
+      break;
+    case VOLUME_SOURCE_DEVICE:
+      volume_metadata->volume_source =
+          file_manager_private::VOLUME_SOURCE_DEVICE;
+      break;
+    case VOLUME_SOURCE_NETWORK:
+      volume_metadata->volume_source =
+          file_manager_private::VOLUME_SOURCE_NETWORK;
+      break;
+  }
+
   if (volume.type() == VOLUME_TYPE_PROVIDED) {
     volume_metadata->extension_id.reset(new std::string(volume.extension_id()));
-
     volume_metadata->file_system_id.reset(
         new std::string(volume.file_system_id()));
   }