third_party/protobuf: Update to HEAD (83d681ee2c)

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

Index: third_party/protobuf/src/google/protobuf/util/internal/json_objectwriter.h
diff --git a/third_party/protobuf/src/google/protobuf/util/internal/json_objectwriter.h b/third_party/protobuf/src/google/protobuf/util/internal/json_objectwriter.h
index cb7e2fb30c4fec5b621f720de734be48250cfbb9..31edc2927ffe38b957ae7648df462f13ebdac69e 100644
--- a/third_party/protobuf/src/google/protobuf/util/internal/json_objectwriter.h
+++ b/third_party/protobuf/src/google/protobuf/util/internal/json_objectwriter.h
@@ -93,7 +93,8 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
         stream_(out),
         sink_(out),
         indent_string_(indent_string.ToString()),
-        use_websafe_base64_for_bytes_(false) {}
+        use_websafe_base64_for_bytes_(false),
+        empty_name_ok_for_next_key_(false) {}
   virtual ~JsonObjectWriter();
 
   // ObjectWriter methods.
@@ -111,11 +112,19 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
   virtual JsonObjectWriter* RenderString(StringPiece name, StringPiece value);
   virtual JsonObjectWriter* RenderBytes(StringPiece name, StringPiece value);
   virtual JsonObjectWriter* RenderNull(StringPiece name);
+  virtual JsonObjectWriter* RenderNullAsEmpty(StringPiece name);
 
   void set_use_websafe_base64_for_bytes(bool value) {
     use_websafe_base64_for_bytes_ = value;
   }
 
+  // Whether empty strings should be rendered for the next JSON key. This
+  // setting is only valid until the next key is rendered, after which it gets
+  // reset to false.
+  virtual void empty_name_ok_for_next_key() {
+    empty_name_ok_for_next_key_ = true;
+  }
+
  protected:
   class LIBPROTOBUF_EXPORT Element : public BaseElement {
    public:
@@ -195,6 +204,10 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
   // Writes an individual character to the output.
   void WriteChar(const char c) { stream_->WriteRaw(&c, sizeof(c)); }
 
+  // Returns the current value of empty_name_ok_for_next_key_ and resets it to
+  // false.
+  bool GetAndResetEmptyKeyOk();
+
   google::protobuf::scoped_ptr<Element> element_;
   google::protobuf::io::CodedOutputStream* stream_;
   ByteSinkWrapper sink_;
@@ -204,6 +217,11 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
   // to regular base64 encoding.
   bool use_websafe_base64_for_bytes_;
 
+  // Whether empty strings should be rendered for the next JSON key. This
+  // setting is only valid until the next key is rendered, after which it gets
+  // reset to false.
+  bool empty_name_ok_for_next_key_;
+
   GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(JsonObjectWriter);
 };