Add HasChangeListKind and HasFileListKind methods.

chrome/browser/google_apis/drive_api_parser.h

Index: chrome/browser/google_apis/drive_api_parser.h
diff --git a/chrome/browser/google_apis/drive_api_parser.h b/chrome/browser/google_apis/drive_api_parser.h
index 118a5a3816f431f854e25781db22f841327ee3a1..a20ad3a1f6feb7e8ad55649c80b66b65900fa3b1 100644
--- a/chrome/browser/google_apis/drive_api_parser.h
+++ b/chrome/browser/google_apis/drive_api_parser.h
@@ -631,6 +631,9 @@ class FileList {
   static void RegisterJSONConverter(
       base::JSONValueConverter<FileList>* converter);
 
+  // Returns true if the |value| has kind field for FileList.
+  static bool HasFileListKind(const base::Value& value);
+
   // Creates file list from parsed JSON.
   static scoped_ptr<FileList> CreateFrom(const base::Value& value);
 
@@ -746,6 +749,9 @@ class ChangeList {
   static void RegisterJSONConverter(
       base::JSONValueConverter<ChangeList>* converter);
 
+  // Returns true if the |value| has kind field for ChangeList.
+  static bool HasChangeListKind(const base::Value& value);
+
   // Creates change list from parsed JSON.
   static scoped_ptr<ChangeList> CreateFrom(const base::Value& value);