Add protobuf definitions

Add protobuf definitions for binaryblob store, and change data types
to the generated class.

Signed-off-by: Kun Yi <kunyi@google.com>
Change-Id: I856a000c4a81c10bbbd1983d51712b4999a4e29e
diff --git a/.gitignore b/.gitignore
index dad7ab4..fd23289 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,3 +63,7 @@
 *~
 .cscope/
 build/
+
+# protobuf generated files
+*.pb.h
+*.pb.cc