Preserve original int64 time stamp in ResourceResponse.

Source/platform/exported/WebURLResponse.cpp

Index: Source/platform/exported/WebURLResponse.cpp
diff --git a/Source/platform/exported/WebURLResponse.cpp b/Source/platform/exported/WebURLResponse.cpp
index 0bc7c4ae3d45b0174d7a7ee7dac8e444d54a7913..7cbbbfd3e4e33adeeaa2f72955f7d516c6c16533 100644
--- a/Source/platform/exported/WebURLResponse.cpp
+++ b/Source/platform/exported/WebURLResponse.cpp
@@ -169,6 +169,16 @@ void WebURLResponse::setResponseTime(double responseTime)
     m_private->m_resourceResponse->setResponseTime(responseTime);
 }
 
+long long WebURLResponse::originalResponseTime() const
+{
+    return m_private->m_resourceResponse->originalResponseTime();
+}
+
+void WebURLResponse::setOriginalResponseTime(long long originalResponseTime)
+{
+    m_private->m_resourceResponse->setOriginalResponseTime(originalResponseTime);
+}
+
 WebString WebURLResponse::mimeType() const
 {
     return m_private->m_resourceResponse->mimeType();