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..edc8b8981d6594061fb33246b1891d4ae8e3f385
--- /dev/null
+++ b/third_party/WebKit/Source/platform/network/NetworkInstrumentation.cpp
@@ -0,0 +1,83 @@
+// 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/tracing/TracedValue.h"
+
+namespace network_instrumentation {
+
+using network_instrumentation::RequestOutcome;
+using blink::TracedValue;
+
+const char kBlinkResourceID[] = "BlinkResourceID";
+const char kResourceLoadTitle[] = "ResourceLoad";
+const char kInitialResourcePrioritySetTitle[] = "InitialResourcePrioritySet";
+const char kResourcePriorityChangedTitle[] = "ResourcePriorityChanged";
+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();
+  }
+}
+
+ScopedResourceLoadTracker::ScopedResourceLoadTracker(
+    unsigned long resourceID,
+    const blink::ResourceRequest& request)
+    : closeSliceAtEndOfScope(true), 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 (this->closeSliceAtEndOfScope)

[caseq, 2016/11/08 18:24:32]

we generally don't mention this-> explicitly.

[dproy, 2016/11/09 20:44:00]

Done for all the `this` cases.

+    endResourceLoad(this->resourceID, RequestOutcome::Fail);

[caseq, 2016/11/08 18:24:32]

ditto.

+}
+
+void ScopedResourceLoadTracker::doNotCloseSliceAtEndOfScope() {
+  this->closeSliceAtEndOfScope = false;

[caseq, 2016/11/08 18:24:32]

ditto.

+}
+
+void initialResourcePrioritySet(unsigned long resourceID,
+                                blink::ResourceLoadPriority priority) {
+  std::unique_ptr<TracedValue> data = TracedValue::create();
+  data->setInteger("initialPriority", priority);

[caseq, 2016/11/08 18:24:32]

ditto.

+  TRACE_EVENT_NESTABLE_ASYNC_INSTANT1(
+      kNetInstrumentationCategory, kInitialResourcePrioritySetTitle,
+      TRACE_ID_WITH_SCOPE(kBlinkResourceID, TRACE_ID_LOCAL(resourceID)), "data",
+      std::move(data));
+}
+
+void resourcePriorityChanged(unsigned long resourceID,
+                             blink::ResourceLoadPriority priority) {
+  std::unique_ptr<TracedValue> data = TracedValue::create();
+  data->setInteger("newPriority", priority);
+  TRACE_EVENT_NESTABLE_ASYNC_INSTANT1(
+      kNetInstrumentationCategory, kResourcePriorityChangedTitle,
+      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