Add trace event for complete network request

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

Index: third_party/WebKit/Source/platform/network/NetworkInstrumentation.h
diff --git a/third_party/WebKit/Source/platform/network/NetworkInstrumentation.h b/third_party/WebKit/Source/platform/network/NetworkInstrumentation.h
new file mode 100644
index 0000000000000000000000000000000000000000..339f7409b970b0f37181a64eaed7ffd9cac84e46
--- /dev/null
+++ b/third_party/WebKit/Source/platform/network/NetworkInstrumentation.h
@@ -0,0 +1,39 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NetworkInstrumentation_h
+#define NetworkInstrumentation_h
+
+#include "platform/PlatformExport.h"
+#include "platform/network/ResourceRequest.h"
+
+namespace network_instrumentation {
+
+enum RequestOutcome { Success, Fail };
+
+class PLATFORM_EXPORT ScopedResourceLoadTracker {
+ public:
+  ScopedResourceLoadTracker(unsigned long resourceID,
+                            const blink::ResourceRequest&);
+  ~ScopedResourceLoadTracker();
+  void doNotCloseSliceAtEndOfScope();
+
+ private:
+  bool closeSliceAtEndOfScope;
+  const unsigned long resourceID;
+  const blink::ResourceRequest request;

[chiniforooshan, 2016/11/03 15:50:36]

I don't see why we need to store the request?

[dproy, 2016/11/03 16:27:19]

You're right - there's no reason to store it. Fixed.

+
+  DISALLOW_COPY_AND_ASSIGN(ScopedResourceLoadTracker);
+};
+
+void PLATFORM_EXPORT beginResourceLoad(unsigned long resourceID,
+                                       const blink::ResourceRequest&);
+
+void PLATFORM_EXPORT endResourceLoad(unsigned long resourceID, RequestOutcome);
+
+const char* RequestOutcomeToString(RequestOutcome);
+
+}  // namespace network_instrumentation
+
+#endif  // NetworkInstrumentation_h