Add trace event for complete network request

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

Index: third_party/WebKit/Source/platform/network/NetworkInstrumentation.cpp
diff --git a/third_party/WebKit/Source/platform/network/NetworkInstrumentation.cpp b/third_party/WebKit/Source/platform/network/NetworkInstrumentation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..bb2a7d232488411a64581b04fb068c5efe9621f2
--- /dev/null
+++ b/third_party/WebKit/Source/platform/network/NetworkInstrumentation.cpp
@@ -0,0 +1,75 @@
+// 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.
+
+#include "platform/network/NetworkInstrumentation.h"
+
+#include "base/trace_event/trace_event.h"
+#include "platform/network/ResourceLoadPriority.h"
+#include "platform/network/ResourceRequest.h"
+#include "platform/tracing/TracedValue.h"
+
+namespace network_instrumentation {
+
+using network_instrumentation::RequestOutcome;
+using blink::TracedValue;
+
+const char kBlinkResourceID[] = "BlinkResourceID";
+const char kResourceLoadTitle[] = "ResourceLoad";
+const char kResourcePrioritySetTitle[] = "ResourcePrioritySet";
+const char kNetInstrumentationCategory[] = TRACE_DISABLED_BY_DEFAULT("network");
+
+const char* RequestOutcomeToString(RequestOutcome outcome) {
+  switch (outcome) {
+    case RequestOutcome::Success:
+      return "Success";
+    case RequestOutcome::Fail:
+      return "Fail";
+    default:
+      NOTREACHED();
+      // We need to return something to avoid compiler warning.
+      return "This should never happen";
+  }
+}
+
+ScopedResourceLoadTracker::ScopedResourceLoadTracker(
+    unsigned long resourceID,
+    const blink::ResourceRequest& request)
+    : m_resourceLoadContinuesBeyondScope(false), m_resourceID(resourceID) {
+  std::unique_ptr<TracedValue> beginData = TracedValue::create();
+  beginData->setString("url", request.url().getString());
+  TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(
+      kNetInstrumentationCategory, kResourceLoadTitle,
+      TRACE_ID_WITH_SCOPE(kBlinkResourceID, TRACE_ID_LOCAL(resourceID)),
+      "beginData", std::move(beginData));
+}
+
+ScopedResourceLoadTracker::~ScopedResourceLoadTracker() {
+  if (!m_resourceLoadContinuesBeyondScope)
+    endResourceLoad(m_resourceID, RequestOutcome::Fail);
+}
+
+void ScopedResourceLoadTracker::resourceLoadContinuesBeyondScope() {
+  m_resourceLoadContinuesBeyondScope = true;
+}
+
+void resourcePrioritySet(unsigned long resourceID,
+                         blink::ResourceLoadPriority priority) {
+  std::unique_ptr<TracedValue> data = TracedValue::create();
+  data->setInteger("priority", priority);
+  TRACE_EVENT_NESTABLE_ASYNC_INSTANT1(
+      kNetInstrumentationCategory, kResourcePrioritySetTitle,
+      TRACE_ID_WITH_SCOPE(kBlinkResourceID, TRACE_ID_LOCAL(resourceID)), "data",
+      std::move(data));
+}
+
+void endResourceLoad(unsigned long resourceID, RequestOutcome outcome) {
+  std::unique_ptr<TracedValue> endData = TracedValue::create();
+  endData->setString("outcome", RequestOutcomeToString(outcome));
+  TRACE_EVENT_NESTABLE_ASYNC_END1(
+      kNetInstrumentationCategory, kResourceLoadTitle,
+      TRACE_ID_WITH_SCOPE(kBlinkResourceID, TRACE_ID_LOCAL(resourceID)),
+      "endData", std::move(endData));
+}
+
+}  // namespace network_instrumentation