Enable ServerTiming support

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

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
index c1289356bf8018e79a48e839c5387a14de0a2e52..b3fa8c81abaf013db1cb908ebc882c54a142888c 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -65,6 +65,7 @@
 #include "core/svg/graphics/SVGImageChromeClient.h"
 #include "core/timing/DOMWindowPerformance.h"
 #include "core/timing/Performance.h"
+#include "core/timing/PerformanceBase.h"
 #include "platform/WebFrameScheduler.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/instrumentation/tracing/TracedValue.h"
@@ -536,6 +537,18 @@ void FrameFetchContext::dispatchDidReceiveResponse(
   // It is essential that inspector gets resource response BEFORE console.
   frame()->console().reportResourceResponseReceived(documentLoader, identifier,
                                                     response);
+
+  // MainResource responses were already added, skip them here.
+  if (RuntimeEnabledFeatures::serverTimingEnabled() &&
+      resource->getType() != Resource::MainResource && frame()->document() &&
+      frame()->document()->domWindow()) {
+    LocalDOMWindow* localDOMWindow = frame()->document()->domWindow();
+    DOMWindowPerformance::performance(*localDOMWindow)
+        ->addServerTiming(response,
+                          localDOMWindow->hasLoadEventFired()
+                              ? PerformanceBase::ShouldAddToBuffer::Never
+                              : PerformanceBase::ShouldAddToBuffer::Always);
+  }
 }
 
 void FrameFetchContext::dispatchDidReceiveData(unsigned long identifier,