vboot_reference: add creation of GBB blob to gbb_utility

utility/include/gbb_utility.h

Index: utility/include/gbb_utility.h
diff --git a/utility/include/gbb_utility.h b/utility/include/gbb_utility.h
index 468cddf99b999aef17af6d9d1c984f6a3b6bbee2..55d4a390bfa3ce4531795de582f764d69be81fa5 100644
--- a/utility/include/gbb_utility.h
+++ b/utility/include/gbb_utility.h
@@ -7,6 +7,7 @@
 #define VBOOT_REFERENCE_GBB_UTILITY_H_
 
 #include <string>
+#include <vector>
 #include "gbb_header.h"
 
 namespace vboot_reference {
@@ -33,6 +34,11 @@ class GoogleBinaryBlockUtil {
   // return true on success.
   bool save_to_file(const char *filename);
 
+  // create a new GBB blob by providing a list of reserved data size for each
+  // properties, following the order described in GoogleBinaryBlockHeader.
+  // return true on success.
+  bool create_new(const std::vector<uint32_t> &create_param);
+
   // retrieve the value of a property from GBB data.
   // return the property value.
   std::string get_property(PROPINDEX i) const;
@@ -86,4 +92,3 @@ class GoogleBinaryBlockUtil {
 }  // namespace vboot_reference
 
 #endif  // VBOOT_REFERENCE_GBB_UTILITY_H_
-