transferSize implementation

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index c264aa70e61d854b124a7713dee1358429a496bf..6d82169a519546b1057e59f98edab6fc98ca4a6b 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -107,6 +107,7 @@ DocumentLoader::DocumentLoader(LocalFrame* frame,
                          ClientRedirectPolicy::ClientRedirect),
       m_replacesCurrentHistoryItem(false),
       m_dataReceived(false),
+      m_mainResourceIdentifier(0),
       m_navigationType(NavigationTypeOther),
       m_documentLoadTiming(*this),
       m_timeOfLastDataReceived(0.0),
@@ -145,7 +146,11 @@ DEFINE_TRACE(DocumentLoader) {
 }
 
 unsigned long DocumentLoader::mainResourceIdentifier() const {
-  return m_mainResource ? m_mainResource->identifier() : 0;
+  return m_mainResourceIdentifier;
+}
+
+ResourceTimingInfo* DocumentLoader::getMainResourceTimingInfo() const {
+  return fetcher()->getMainResourceTimingInfo(mainResourceIdentifier());
 }
 
 const ResourceRequest& DocumentLoader::originalRequest() const {
@@ -718,6 +723,7 @@ void DocumentLoader::startLoadingMainResource() {
                             mainResourceLoadOptions);
   m_mainResource =
       RawResource::fetchMainResource(fetchRequest, fetcher(), m_substituteData);
+  m_mainResourceIdentifier = m_mainResource ? m_mainResource->identifier() : 0;
 
   // PlzNavigate:
   // The final access checks are still performed here, potentially rejecting