ServiceWorker: Insert TRACE_EVENT to watch a breakdown of the ServiceWorker's performance on chome:…

content/browser/service_worker/service_worker_write_to_cache_job.cc

Index: content/browser/service_worker/service_worker_write_to_cache_job.cc
diff --git a/content/browser/service_worker/service_worker_write_to_cache_job.cc b/content/browser/service_worker/service_worker_write_to_cache_job.cc
index 1928a531e3ff8c844b0df52ea405ee72b6046760..ede1cd15c37d081c0dd2e1977302773a60cfa5fb 100644
--- a/content/browser/service_worker/service_worker_write_to_cache_job.cc
+++ b/content/browser/service_worker/service_worker_write_to_cache_job.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/service_worker/service_worker_write_to_cache_job.h"
 
+#include "base/debug/trace_event.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_disk_cache.h"
 #include "content/browser/service_worker/service_worker_metrics.h"
@@ -44,6 +45,10 @@ ServiceWorkerWriteToCacheJob::~ServiceWorkerWriteToCacheJob() {
 }
 
 void ServiceWorkerWriteToCacheJob::Start() {
+  TRACE_EVENT_ASYNC_BEGIN1("ServiceWorker",
+                           "ServiceWorkerWriteToCacheJob",
+                           this,
+                           "URL", request_->url().spec());
   if (!context_) {
     NotifyStartError(net::URLRequestStatus(
         net::URLRequestStatus::FAILED, net::ERR_FAILED));
@@ -154,6 +159,10 @@ void ServiceWorkerWriteToCacheJob::InitNetRequest(
 }
 
 void ServiceWorkerWriteToCacheJob::StartNetRequest() {
+  TRACE_EVENT_ASYNC_STEP_INTO0("ServiceWorker",
+                               "ServiceWorkerWriteToCacheJob",
+                               this,
+                               "NetRequest");
   net_request_->Start();  // We'll continue in OnResponseStarted.
 }
 
@@ -190,6 +199,10 @@ void ServiceWorkerWriteToCacheJob::WriteHeadersToCache() {
         net::URLRequestStatus::FAILED, net::ERR_FAILED));
     return;
   }
+  TRACE_EVENT_ASYNC_STEP_INTO0("ServiceWorker",
+                               "ServiceWorkerWriteToCacheJob",
+                               this,
+                               "WriteHeadersToCache");
   writer_ = context_->storage()->CreateResponseWriter(response_id_);
   info_buffer_ = new HttpResponseInfoIOBuffer(
       new net::HttpResponseInfo(net_request_->response_info()));
@@ -211,11 +224,20 @@ void ServiceWorkerWriteToCacheJob::OnWriteHeadersComplete(int result) {
   }
   http_info_.reset(info_buffer_->http_info.release());
   info_buffer_ = NULL;
+  TRACE_EVENT_ASYNC_STEP_INTO0("ServiceWorker",
+                               "ServiceWorkerWriteToCacheJob",
+                               this,
+                               "WriteHeadersToCacheCompleted");
   NotifyHeadersComplete();
 }
 
 void ServiceWorkerWriteToCacheJob::WriteDataToCache(int amount_to_write) {
   DCHECK_NE(0, amount_to_write);
+  TRACE_EVENT_ASYNC_STEP_INTO1("ServiceWorker",
+                               "ServiceWorkerWriteToCacheJob",
+                               this,
+                               "WriteDataToCache",
+                               "Amount to write", amount_to_write);
   SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
   writer_->WriteData(
       io_buffer_.get(),
@@ -243,6 +265,9 @@ void ServiceWorkerWriteToCacheJob::OnWriteDataComplete(int result) {
       ServiceWorkerMetrics::WRITE_OK);
   SetStatus(net::URLRequestStatus());  // Clear the IO_PENDING status
   NotifyReadComplete(result);
+  TRACE_EVENT_ASYNC_END0("ServiceWorker",
+                         "ServiceWorkerWriteToCacheJob",
+                         this);
 }
 
 void ServiceWorkerWriteToCacheJob::OnReceivedRedirect(
@@ -250,6 +275,8 @@ void ServiceWorkerWriteToCacheJob::OnReceivedRedirect(
     const net::RedirectInfo& redirect_info,
     bool* defer_redirect) {
   DCHECK_EQ(net_request_, request);
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerWriteToCacheJob::OnReceivedRedirect");
   // Script resources can't redirect.
   AsyncNotifyDoneHelper(net::URLRequestStatus(
       net::URLRequestStatus::FAILED, net::ERR_FAILED));
@@ -259,6 +286,8 @@ void ServiceWorkerWriteToCacheJob::OnAuthRequired(
     net::URLRequest* request,
     net::AuthChallengeInfo* auth_info) {
   DCHECK_EQ(net_request_, request);
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerWriteToCacheJob::OnAuthRequired");
   // TODO(michaeln): Pass this thru to our jobs client.
   AsyncNotifyDoneHelper(net::URLRequestStatus(
       net::URLRequestStatus::FAILED, net::ERR_FAILED));
@@ -268,6 +297,8 @@ void ServiceWorkerWriteToCacheJob::OnCertificateRequested(
     net::URLRequest* request,
     net::SSLCertRequestInfo* cert_request_info) {
   DCHECK_EQ(net_request_, request);
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerWriteToCacheJob::OnCertificateRequested");
   // TODO(michaeln): Pass this thru to our jobs client.
   // see NotifyCertificateRequested.
   AsyncNotifyDoneHelper(net::URLRequestStatus(
@@ -279,6 +310,8 @@ void ServiceWorkerWriteToCacheJob:: OnSSLCertificateError(
     const net::SSLInfo& ssl_info,
     bool fatal) {
   DCHECK_EQ(net_request_, request);
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerWriteToCacheJob::OnSSLCertificateError");
   // TODO(michaeln): Pass this thru to our jobs client,
   // see NotifySSLCertificateError.
   AsyncNotifyDoneHelper(net::URLRequestStatus(
@@ -289,6 +322,8 @@ void ServiceWorkerWriteToCacheJob::OnBeforeNetworkStart(
     net::URLRequest* request,
     bool* defer) {
   DCHECK_EQ(net_request_, request);
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerWriteToCacheJob::OnBeforeNetworkStart");
   NotifyBeforeNetworkStart(defer);
 }
 
@@ -333,6 +368,10 @@ void ServiceWorkerWriteToCacheJob::OnReadCompleted(
     WriteDataToCache(bytes_read);
     return;
   }
+  TRACE_EVENT_ASYNC_STEP_INTO0("ServiceWorker",
+                               "ServiceWorkerWriteToCacheJob",
+                               this,
+                               "WriteHeadersToCache");
   // We're done with all.
   AsyncNotifyDoneHelper(request->status());
   return;