third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h

Index: third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h
diff --git a/third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h b/third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h
index 1d85bed85f8a4f9a5c522db1893867369aee340f..5f3b25f3785000346b27cd5228eb49cd22795d9b 100644
--- a/third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h
+++ b/third_party/protobuf/src/google/protobuf/util/internal/default_value_objectwriter.h
@@ -122,6 +122,10 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
   // field_scrub_callback pointer is also transferred to this class
   void RegisterFieldScrubCallBack(FieldScrubCallBackPtr field_scrub_callback);
 
+  // If set to true, empty lists are suppressed from output when default values
+  // are written.
+  void set_suppress_empty_list(bool value) { suppress_empty_list_ = value; }
+
  private:
   enum NodeKind {
     PRIMITIVE = 0,
@@ -136,7 +140,7 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
    public:
     Node(const string& name, const google::protobuf::Type* type, NodeKind kind,
          const DataPiece& data, bool is_placeholder, const vector<string>& path,
-         FieldScrubCallBack* field_scrub_callback);
+         bool suppress_empty_list, FieldScrubCallBack* field_scrub_callback);
     virtual ~Node() {
       for (int i = 0; i < children_.size(); ++i) {
         delete children_[i];
@@ -212,6 +216,9 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
     // Path of the field of this node
     std::vector<string> path_;
 
+    // Whether to suppress empty list output.
+    bool suppress_empty_list_;
+
     // Pointer to function for determining whether a field needs to be scrubbed
     // or not. This callback is owned by the creator of this node.
     FieldScrubCallBack* field_scrub_callback_;
@@ -257,6 +264,9 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
   // The stack to hold the path of Nodes from current_ to root_;
   std::stack<Node*> stack_;
 
+  // Whether to suppress output of empty lists.
+  bool suppress_empty_list_;
+
   // Unique Pointer to function for determining whether a field needs to be
   // scrubbed or not.
   FieldScrubCallBackPtr field_scrub_callback_;