Implement nextHopProtocol in PerformanceResourceTiming and PerformanceNavigationTiming.

third_party/WebKit/Source/platform/network/ResourceResponse.h

Index: third_party/WebKit/Source/platform/network/ResourceResponse.h
diff --git a/third_party/WebKit/Source/platform/network/ResourceResponse.h b/third_party/WebKit/Source/platform/network/ResourceResponse.h
index 49324615967e23b69f5c00ee4cf26f10d9486fc1..bc5e4df544696fe27e91a4d80db9bd28cc2d92d5 100644
--- a/third_party/WebKit/Source/platform/network/ResourceResponse.h
+++ b/third_party/WebKit/Source/platform/network/ResourceResponse.h
@@ -322,6 +322,13 @@ class PLATFORM_EXPORT ResourceResponse final {
     m_remoteIPAddress = value;
   }
 
+  const AtomicString& alpnNegotiatedProtocol() const {
+    return m_alpnNegotiatedProtocol;
+  }
+  void setALPNNegotiatedProtocol(const AtomicString& value) {
+    m_alpnNegotiatedProtocol = value;
+  }
+
   unsigned short remotePort() const { return m_remotePort; }
   void setRemotePort(unsigned short value) { m_remotePort = value; }
 
@@ -465,6 +472,9 @@ class PLATFORM_EXPORT ResourceResponse final {
   // Remote IP address of the socket which fetched this resource.
   AtomicString m_remoteIPAddress;
 
+  // ALPN negotiated protocol of the socket which fetched this resource.
+  AtomicString m_alpnNegotiatedProtocol;
+
   // Remote port number of the socket which fetched this resource.
   unsigned short m_remotePort;
 
@@ -538,6 +548,7 @@ struct CrossThreadResourceResponseData {
   String m_cacheStorageCacheName;
   int64_t m_responseTime;
   String m_remoteIPAddress;
+  String m_alpnNegotiatedProtocol;
   unsigned short m_remotePort;
   long long m_encodedDataLength;
   long long m_encodedBodyLength;