Implement nextHopProtocol in PerformanceResourceTiming and PerformanceNavigationTiming.

third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp b/third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp
index b7bd359cf3fdf37b8ccbf6fe5b74d7c36de16040..3204e5137158bbb8de2ac5b70a9d0bb16a6ff67d 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceResponse.cpp
@@ -101,6 +101,8 @@ ResourceResponse::ResourceResponse()
       did_service_worker_navigation_preload_(false),
       response_time_(0),
       remote_port_(0),
+      connection_info_(
+          net::HttpResponseInfo::ConnectionInfo::CONNECTION_INFO_UNKNOWN),
       encoded_data_length_(0),
       encoded_body_length_(0),
       decoded_body_length_(0) {}
@@ -573,6 +575,13 @@ KURL ResourceResponse::OriginalURLViaServiceWorker() const {
   return url_list_via_service_worker_.back();
 }
 
+String ResourceResponse::ConnectionInfoString() const {
+  std::string connection_info_string =
+      net::HttpResponseInfo::ConnectionInfoToString(connection_info_);
+  return String::FromUTF8(connection_info_string.c_str(),
+                          connection_info_string.size());
+}
+
 void ResourceResponse::SetEncodedDataLength(long long value) {
   encoded_data_length_ = value;
 }