Adding GOOGLE_INTERNAL and local_modifications to metadata.proto

Test: Treehugger
Change-Id: I7716bf1e1d9cbe38843bd34ceaa496d2d3b4fbe0
diff --git a/metadata.proto b/metadata.proto
index 7e979b8..f7eb007 100644
--- a/metadata.proto
+++ b/metadata.proto
@@ -43,6 +43,7 @@
 
 enum DirectoryType {
   PACKAGE = 1;
+  GOOGLE_INTERNAL = 4;
 }
 
 message ThirdPartyMetaData {
@@ -50,6 +51,7 @@
   optional string version = 2;
   optional LicenseType license_type = 4;
   optional string license_note = 5;
+  optional string local_modifications = 6;
   optional Security security = 7;
   optional Date last_upgrade_date = 10;
   optional DirectoryType type = 11 [default = PACKAGE];