Google drive forms should not appear in the "offline" tab of Files.app.

google_apis/drive/gdata_wapi_parser.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 GOOGLE_APIS_DRIVE_GDATA_WAPI_PARSER_H_
 #define GOOGLE_APIS_DRIVE_GDATA_WAPI_PARSER_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 491 matching lines @@
   // Classes of EntryKind. Used for ClassifyEntryKind().
   enum EntryKindClass {
     KIND_OF_NONE = 0,
     KIND_OF_HOSTED_DOCUMENT = 1,
     KIND_OF_GOOGLE_DOCUMENT = 1 << 1,
     KIND_OF_EXTERNAL_DOCUMENT = 1 << 2,
     KIND_OF_FOLDER = 1 << 3,
     KIND_OF_FILE = 1 << 4,
   };
 
+  // Returns the kind enum corresponding to the extension in form ".xxx".
+  static DriveEntryKind GetEntryKindFromExtension(const std::string& extension);
+
   // Classifies the EntryKind. The returned value is a bitmask of
   // EntryKindClass. For example, DOCUMENT is classified as
   // KIND_OF_HOSTED_DOCUMENT and KIND_OF_GOOGLE_DOCUMENT, hence the returned
   // value is KIND_OF_HOSTED_DOCUMENT | KIND_OF_GOOGLE_DOCUMENT.
   static int ClassifyEntryKind(DriveEntryKind kind);
 
   // Classifies the EntryKind by the file extension of specific path. The
   // returned value is a bitmask of EntryKindClass. See also ClassifyEntryKind.
   static int ClassifyEntryKindByFileExtension(const base::FilePath& file);
 
@@ skipping 335 matching lines @@
   int64 largest_changestamp_;
   ScopedVector<InstalledApp> installed_apps_;
 
   DISALLOW_COPY_AND_ASSIGN(AccountMetadata);
 };
 
 
 }  // namespace google_apis
 
 #endif  // GOOGLE_APIS_DRIVE_GDATA_WAPI_PARSER_H_