Add a data-driven unit test to validate autofill profile merging during aggregation.

chrome/browser/autofill/autofill_type.h

Index: chrome/browser/autofill/autofill_type.h
diff --git a/chrome/browser/autofill/autofill_type.h b/chrome/browser/autofill/autofill_type.h
index 5aac13445ae272368c4f86f26e9d0ab690630ca1..a7861af730f23780e165140ac374a58ef270034b 100644
--- a/chrome/browser/autofill/autofill_type.h
+++ b/chrome/browser/autofill/autofill_type.h
@@ -8,6 +8,7 @@
 
 #include <map>
 #include <set>
+#include <string>
 
 #include "base/string16.h"
 #include "chrome/browser/autofill/field_types.h"
@@ -63,6 +64,10 @@ class AutoFillType {
   // the returned field type as the first parameter).
   static AutoFillFieldType GetEquivalentFieldType(AutoFillFieldType field_type);
 
+  // Utilities for serializing and deserializing an |AutoFillFieldType|.
+  static std::string FieldTypeToString(AutoFillFieldType field_type);
+  static AutoFillFieldType StringToFieldType(const std::string& str);
+
  private:
   AutoFillFieldType field_type_;
 };