mediaview: Skeleton for ARC Documents Provider FS.

storage/common/fileapi/file_system_types.h

Index: storage/common/fileapi/file_system_types.h
diff --git a/storage/common/fileapi/file_system_types.h b/storage/common/fileapi/file_system_types.h
index 6ac262cc4ff1b3175f58a698eac11c7e87c3f602..cc4e1013b4b2a37226570c61c27c4d24714d2441 100644
--- a/storage/common/fileapi/file_system_types.h
+++ b/storage/common/fileapi/file_system_types.h
@@ -126,6 +126,9 @@ enum FileSystemType {
   // A filesystem to provide access to contents managed by ARC.
   kFileSystemTypeArcContent,
 
+  // A filesystem to provide access to documents providers in ARC.
+  kFileSystemTypeArcDocumentsProvider,
+
   // --------------------------------------------------------------------
   // Marks the end of internal type enum. (This is not the actual fs type)
   // New internal filesystem types must be added above this line.