Surface pushState event

third_party/WebKit/Source/core/frame/History.h

Index: third_party/WebKit/Source/core/frame/History.h
diff --git a/third_party/WebKit/Source/core/frame/History.h b/third_party/WebKit/Source/core/frame/History.h
index 4d3ab7d5e410eceb70b6475aabb9f9b61bf58f01..708b9b7e09a40f1ef7efae83dd1f0132d217280c 100644
--- a/third_party/WebKit/Source/core/frame/History.h
+++ b/third_party/WebKit/Source/core/frame/History.h
@@ -32,6 +32,7 @@
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "platform/heap/Handle.h"
+#include "platform/instrumentation/tracing/TraceEvent.h"
 #include "wtf/Forward.h"
 
 namespace blink {
@@ -63,6 +64,7 @@ class CORE_EXPORT History final : public GarbageCollectedFinalized<History>,
                  const String& title,
                  const String& url,
                  ExceptionState& exceptionState) {
+    TRACE_EVENT0("spa:navigation", "History::pushState");

[tdresser, 2017/01/26 20:01:53]

I think we can just use "blink" as the category.
Let's move this method to the cpp.

     stateObjectAdded(std::move(data), title, url, scrollRestorationInternal(),
                      FrameLoadTypeStandard, exceptionState);
   }