[Not for review] Add traces for crbug.com/726626

third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp

 // Copyright 2014 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 "modules/serviceworkers/FetchEvent.h"
 
 #include "bindings/core/v8/ToV8ForCore.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/timing/WorkerGlobalScopePerformance.h"
 #include "modules/fetch/BytesConsumerForDataConsumerHandle.h"
 #include "modules/fetch/Request.h"
 #include "modules/fetch/Response.h"
 #include "modules/serviceworkers/FetchRespondWithObserver.h"
 #include "modules/serviceworkers/ServiceWorkerError.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScope.h"
 #include "platform/bindings/ScriptState.h"
 #include "platform/bindings/V8PrivateProperty.h"
+#include "platform/instrumentation/tracing/TraceEvent.h"
 #include "platform/loader/fetch/ResourceTimingInfo.h"
 #include "platform/network/NetworkUtils.h"
 #include "platform/wtf/PtrUtil.h"
 #include "platform/wtf/RefPtr.h"
 #include "public/platform/WebURLResponse.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerError.h"
 
 namespace blink {
 
 FetchEvent* FetchEvent::Create(ScriptState* script_state,
@@ skipping 46 matching lines @@
                        const FetchEventInit& initializer,
                        FetchRespondWithObserver* respond_with_observer,
                        WaitUntilObserver* wait_until_observer,
                        bool navigation_preload_sent)
     : ExtendableEvent(type, initializer, wait_until_observer),
       observer_(respond_with_observer),
       preload_response_property_(new PreloadResponseProperty(
           ExecutionContext::From(script_state),
           this,
           PreloadResponseProperty::kPreloadResponse)) {
+  TRACE_EVENT0("ServiceWorker", "FetchEvent::FetchEvent");
   if (!navigation_preload_sent)
     preload_response_property_->ResolveWithUndefined();
 
   client_id_ = initializer.clientId();
   is_reload_ = initializer.isReload();
   if (initializer.hasRequest()) {
     ScriptState::Scope scope(script_state);
     request_ = initializer.request();
     v8::Local<v8::Value> request = ToV8(request_, script_state);
     v8::Local<v8::Value> event = ToV8(this, script_state);
@@ skipping 12 matching lines @@
     // From the same reason as above, setHiddenValue can return false.
     // TODO(yhirano): Add an assertion that it returns true once the
     // graceful shutdown mechanism is introduced.
   }
 }
 
 void FetchEvent::OnNavigationPreloadResponse(
     ScriptState* script_state,
     std::unique_ptr<WebURLResponse> response,
     std::unique_ptr<WebDataConsumerHandle> data_consume_handle) {
+  TRACE_EVENT0("ServiceWorker", "FetchEvent::OnNavigationPreloadResponse");
   if (!script_state->ContextIsValid())
     return;
   DCHECK(preload_response_property_);
   DCHECK(!preload_response_);
   ScriptState::Scope scope(script_state);
   preload_response_ = std::move(response);
-  FetchResponseData* response_data =
-      data_consume_handle
-          ? FetchResponseData::CreateWithBuffer(new BodyStreamBuffer(
-                script_state, new BytesConsumerForDataConsumerHandle(
-                                  ExecutionContext::From(script_state),
-                                  std::move(data_consume_handle))))
-          : FetchResponseData::Create();
+  FetchResponseData* response_data;
+  {
+    if (data_consume_handle) {
+      BytesConsumerForDataConsumerHandle* bytes_consumer;
+      {
+        TRACE_EVENT0("ServiceWorker",
+                     "FetchEvent::OnNavigationPreloadResponse "
+                     "BytesConsumerForDataConsumerHandle");
+        bytes_consumer = new BytesConsumerForDataConsumerHandle(
+            ExecutionContext::From(script_state),
+            std::move(data_consume_handle));
+      }
+      BodyStreamBuffer* buffer;
+      {
+        TRACE_EVENT0(
+            "ServiceWorker",
+            "FetchEvent::OnNavigationPreloadResponse BodyStreamBuffer");
+        buffer = new BodyStreamBuffer(script_state, bytes_consumer);
+      }
+      TRACE_EVENT0("ServiceWorker",
+                   "FetchEvent::OnNavigationPreloadResponse "
+                   "FetchResponseData::CreateWithBuffer");
+      response_data = FetchResponseData::CreateWithBuffer(buffer);
+    } else {
+      TRACE_EVENT0(
+          "ServiceWorker",
+          "FetchEvent::OnNavigationPreloadResponse FetchResponseData::Create");
+      response_data = FetchResponseData::Create();
+    }
+  }
   Vector<KURL> url_list(1);
   url_list[0] = preload_response_->Url();
   response_data->SetURLList(url_list);
   response_data->SetStatus(preload_response_->HttpStatusCode());
   response_data->SetStatusMessage(preload_response_->HttpStatusText());
   response_data->SetResponseTime(
       preload_response_->ToResourceResponse().ResponseTime());
   const HTTPHeaderMap& headers(
       preload_response_->ToResourceResponse().HttpHeaderFields());
   for (const auto& header : headers) {
     response_data->HeaderList()->Append(header.key, header.value);
   }
-  FetchResponseData* tainted_response =
-      NetworkUtils::IsRedirectResponseCode(preload_response_->HttpStatusCode())
-          ? response_data->CreateOpaqueRedirectFilteredResponse()
-          : response_data->CreateBasicFilteredResponse();
-  preload_response_property_->Resolve(
-      Response::Create(ExecutionContext::From(script_state), tainted_response));
+  FetchResponseData* tainted_response;
+  {
+    TRACE_EVENT0(
+        "ServiceWorker",
+        "FetchEvent::OnNavigationPreloadResponse CreateBasicFilteredResponse");
+    tainted_response =
+        NetworkUtils::IsRedirectResponseCode(
+            preload_response_->HttpStatusCode())
+            ? response_data->CreateOpaqueRedirectFilteredResponse()
+            : response_data->CreateBasicFilteredResponse();
+  }
+  {
+    TRACE_EVENT0("ServiceWorker",
+                 "FetchEvent::OnNavigationPreloadResponse Resolve");
+    preload_response_property_->Resolve(Response::Create(
+        ExecutionContext::From(script_state), tainted_response));
+  }
 }
 
 void FetchEvent::OnNavigationPreloadError(
     ScriptState* script_state,
     std::unique_ptr<WebServiceWorkerError> error) {
   if (!script_state->ContextIsValid())
     return;
   DCHECK(preload_response_property_);
   preload_response_property_->Reject(
       ServiceWorkerError::Take(nullptr, *error.get()));
@@ skipping 27 matching lines @@
 }
 
 DEFINE_TRACE(FetchEvent) {
   visitor->Trace(observer_);
   visitor->Trace(request_);
   visitor->Trace(preload_response_property_);
   ExtendableEvent::Trace(visitor);
 }
 
 }  // namespace blink