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/binarystore.cpp b/binarystore.cpp
index 10aa449..aa9c0dc 100644
--- a/binarystore.cpp
+++ b/binarystore.cpp
@@ -22,9 +22,9 @@
     std::vector<std::string> result;
     result.push_back(baseBlobId_);
 
-    for (const auto& blob : blob_.blobs)
+    for (const auto& blob : blob_.blobs())
     {
-        result.push_back(blob.id);
+        result.push_back(blob.blob_id());
     }
 
     return result;