service worker: Add net_log for fetch event dispatch

content/browser/service_worker/service_worker_fetch_dispatcher.cc

Index: content/browser/service_worker/service_worker_fetch_dispatcher.cc
diff --git a/content/browser/service_worker/service_worker_fetch_dispatcher.cc b/content/browser/service_worker/service_worker_fetch_dispatcher.cc
index 6f0d3844aedf96931ce0ef8377ef0934cb19e892..e36856be44e8ab4eb766643f2db3b35d95700688 100644
--- a/content/browser/service_worker/service_worker_fetch_dispatcher.cc
+++ b/content/browser/service_worker/service_worker_fetch_dispatcher.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/service_worker/service_worker_fetch_dispatcher.h"
 
+#include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ -15,6 +16,7 @@
 namespace content {
 
 namespace {
+
 using EventType = ServiceWorkerMetrics::EventType;
 EventType ResourceTypeToEventType(ResourceType resource_type) {
   switch (resource_type) {
@@ -32,22 +34,60 @@ EventType ResourceTypeToEventType(ResourceType resource_type) {
       return EventType::FETCH_SUB_RESOURCE;
   }
 }
+
+std::unique_ptr<base::Value> NetLogServiceWorkerStatusCallback(
+    ServiceWorkerStatusCode status,
+    net::NetLogCaptureMode) {
+  std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
+  dict->SetString("status", ServiceWorkerStatusToString(status));
+  return std::move(dict);
+}
+
+std::unique_ptr<base::Value> NetLogFetchEventCallback(
+    ServiceWorkerStatusCode status,
+    ServiceWorkerFetchEventResult result,
+    net::NetLogCaptureMode) {
+  std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
+  dict->SetString("status", ServiceWorkerStatusToString(status));
+  dict->SetBoolean("has_response",
+                   result == SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE);
+  return std::move(dict);
+}
+
+void EndNetLogEventWithServiceWorkerStatus(const net::BoundNetLog& net_log,
+                                           net::NetLog::EventType type,
+                                           ServiceWorkerStatusCode status) {
+  net_log.EndEvent(type,
+                   base::Bind(&NetLogServiceWorkerStatusCallback, status));
+}
+
 }  // namespace
 
 ServiceWorkerFetchDispatcher::ServiceWorkerFetchDispatcher(
     std::unique_ptr<ServiceWorkerFetchRequest> request,
     ServiceWorkerVersion* version,
     ResourceType resource_type,
+    const net::BoundNetLog& net_log,
     const base::Closure& prepare_callback,
     const FetchCallback& fetch_callback)
     : version_(version),
+      net_log_(net_log),
       prepare_callback_(prepare_callback),
       fetch_callback_(fetch_callback),
       request_(std::move(request)),
       resource_type_(resource_type),
-      weak_factory_(this) {}
+      did_complete_(false),
+      weak_factory_(this) {
+  net_log_.BeginEvent(net::NetLog::TYPE_SERVICE_WORKER_DISPATCH_FETCH_EVENT,
+                      net::NetLog::StringCallback(
+                          "event_type", ServiceWorkerMetrics::EventTypeToString(
+                                            GetEventType())));
+}
 
-ServiceWorkerFetchDispatcher::~ServiceWorkerFetchDispatcher() {}
+ServiceWorkerFetchDispatcher::~ServiceWorkerFetchDispatcher() {
+  if (!did_complete_)
+    net_log_.EndEvent(net::NetLog::TYPE_SERVICE_WORKER_DISPATCH_FETCH_EVENT);
+}
 
 void ServiceWorkerFetchDispatcher::Run() {
   DCHECK(version_->status() == ServiceWorkerVersion::ACTIVATING ||
@@ -55,14 +95,20 @@ void ServiceWorkerFetchDispatcher::Run() {
       << version_->status();
 
   if (version_->status() == ServiceWorkerVersion::ACTIVATING) {
+    net_log_.BeginEvent(net::NetLog::TYPE_SERVICE_WORKER_WAIT_FOR_ACTIVATION);
     version_->RegisterStatusChangeCallback(
-        base::Bind(&ServiceWorkerFetchDispatcher::StartWorker,
+        base::Bind(&ServiceWorkerFetchDispatcher::DidWaitForActivation,
                    weak_factory_.GetWeakPtr()));
     return;
   }
   StartWorker();
 }
 
+void ServiceWorkerFetchDispatcher::DidWaitForActivation() {
+  net_log_.EndEvent(net::NetLog::TYPE_SERVICE_WORKER_WAIT_FOR_ACTIVATION);
+  StartWorker();
+}
+
 void ServiceWorkerFetchDispatcher::StartWorker() {
   // We might be REDUNDANT if a new worker started activating and kicked us out
   // before we could finish activation.
@@ -71,14 +117,32 @@ void ServiceWorkerFetchDispatcher::StartWorker() {
     DidFail(SERVICE_WORKER_ERROR_ACTIVATE_WORKER_FAILED);
     return;
   }
+
+  if (version_->running_status() == EmbeddedWorkerStatus::RUNNING) {
+    DispatchFetchEvent();
+    return;
+  }
+
+  net_log_.BeginEvent(net::NetLog::TYPE_SERVICE_WORKER_START_WORKER);
   version_->RunAfterStartWorker(
-      GetEventType(),
-      base::Bind(&ServiceWorkerFetchDispatcher::DispatchFetchEvent,
-                 weak_factory_.GetWeakPtr()),
-      base::Bind(&ServiceWorkerFetchDispatcher::DidFail,
+      GetEventType(), base::Bind(&ServiceWorkerFetchDispatcher::DidStartWorker,
+                                 weak_factory_.GetWeakPtr()),
+      base::Bind(&ServiceWorkerFetchDispatcher::DidFailToStartWorker,
                  weak_factory_.GetWeakPtr()));
 }
 
+void ServiceWorkerFetchDispatcher::DidStartWorker() {
+  net_log_.EndEvent(net::NetLog::TYPE_SERVICE_WORKER_START_WORKER);
+  DispatchFetchEvent();
+}
+
+void ServiceWorkerFetchDispatcher::DidFailToStartWorker(
+    ServiceWorkerStatusCode status) {
+  EndNetLogEventWithServiceWorkerStatus(
+      net_log_, net::NetLog::TYPE_SERVICE_WORKER_START_WORKER, status);
+  DidFail(status);
+}
+
 void ServiceWorkerFetchDispatcher::DispatchFetchEvent() {
   DCHECK_EQ(EmbeddedWorkerStatus::RUNNING, version_->running_status())
       << "Worker stopped too soon after it was started.";
@@ -87,42 +151,58 @@ void ServiceWorkerFetchDispatcher::DispatchFetchEvent() {
   base::Closure prepare_callback = prepare_callback_;
   prepare_callback.Run();
 
+  net_log_.BeginEvent(net::NetLog::TYPE_SERVICE_WORKER_FETCH_EVENT);
   int request_id = version_->StartRequest(
-      GetEventType(), base::Bind(&ServiceWorkerFetchDispatcher::DidFail,
-                                 weak_factory_.GetWeakPtr()));
+      GetEventType(),
+      base::Bind(&ServiceWorkerFetchDispatcher::DidFailToDispatch,
+                 weak_factory_.GetWeakPtr()));
   version_->DispatchEvent<ServiceWorkerHostMsg_FetchEventFinished>(
       request_id, ServiceWorkerMsg_FetchEvent(request_id, *request_.get()),
       base::Bind(&ServiceWorkerFetchDispatcher::DidFinish,
                  weak_factory_.GetWeakPtr()));
 }
 
-void ServiceWorkerFetchDispatcher::DidPrepare() {
-  DCHECK(!prepare_callback_.is_null());
-  base::Closure prepare_callback = prepare_callback_;
-  prepare_callback.Run();
+void ServiceWorkerFetchDispatcher::DidFailToDispatch(
+    ServiceWorkerStatusCode status) {
+  EndNetLogEventWithServiceWorkerStatus(
+      net_log_, net::NetLog::TYPE_SERVICE_WORKER_FETCH_EVENT, status);
+  DidFail(status);
 }
 
 void ServiceWorkerFetchDispatcher::DidFail(ServiceWorkerStatusCode status) {
-  DCHECK(!fetch_callback_.is_null());
-  FetchCallback fetch_callback = fetch_callback_;
-  scoped_refptr<ServiceWorkerVersion> version = version_;
-  fetch_callback.Run(status, SERVICE_WORKER_FETCH_EVENT_RESULT_FALLBACK,
-                     ServiceWorkerResponse(), version);
+  DCHECK_NE(SERVICE_WORKER_OK, status);
+  Complete(status, SERVICE_WORKER_FETCH_EVENT_RESULT_FALLBACK,
+           ServiceWorkerResponse());
 }
 
 void ServiceWorkerFetchDispatcher::DidFinish(
     int request_id,
     ServiceWorkerFetchEventResult fetch_result,
     const ServiceWorkerResponse& response) {
+  net_log_.EndEvent(net::NetLog::TYPE_SERVICE_WORKER_FETCH_EVENT);
+
   const bool handled =
       (fetch_result == SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE);
   if (!version_->FinishRequest(request_id, handled))
     NOTREACHED() << "Should only receive one reply per event";
 
+  Complete(SERVICE_WORKER_OK, fetch_result, response);
+}
+
+void ServiceWorkerFetchDispatcher::Complete(
+    ServiceWorkerStatusCode status,
+    ServiceWorkerFetchEventResult fetch_result,
+    const ServiceWorkerResponse& response) {
   DCHECK(!fetch_callback_.is_null());
+
+  did_complete_ = true;
+  net_log_.EndEvent(
+      net::NetLog::TYPE_SERVICE_WORKER_DISPATCH_FETCH_EVENT,
+      base::Bind(&NetLogFetchEventCallback, status, fetch_result));
+
   FetchCallback fetch_callback = fetch_callback_;
   scoped_refptr<ServiceWorkerVersion> version = version_;
-  fetch_callback.Run(SERVICE_WORKER_OK, fetch_result, response, version);
+  fetch_callback.Run(status, fetch_result, response, version);
 }
 
 ServiceWorkerMetrics::EventType ServiceWorkerFetchDispatcher::GetEventType()