Add totalBytes and totalDocuments

Author: wu-hui

packages/firestore/src/protos/firestore/bundle.proto

@@ -91,6 +91,12 @@ message BundleMetadata {
 
   // The schema version of the bundle.
   uint32 version = 3;
+
+  // The number of documents in the bundle.
+  uint32 total_documents = 4;
+
+  // The size of the bundle in bytes, excluding this `BundleMetadata`.
+  uint64 total_bytes = 5;
 }
 
 // A Firestore bundle is a length-prefixed stream of JSON representations of 

packages/firestore/src/protos/firestore_bundle_proto.d.ts

@@ -68,6 +68,12 @@ interface BundleMetadata {
 
   /** BundleMetadata version */
   version?: number | null;
+
+  /** BundleMetadata totalDocuments */
+  totalDocuments?: number | null;
+
+  /** BundleMetadata totalBytes */
+  totalBytes?: number | null;
 }
 
 /** Properties of a BundleElement. */