[NOT FOR LANDING] Detailed loading traces

chrome/browser/renderer_host/safe_browsing_resource_throttle.cc

Index: chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
diff --git a/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc b/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
index 891ee982b500dbd4e253a9f7905b9824b02d2fe7..2c781227f80de6b828de94274197258857a4689d 100644
--- a/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
+++ b/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "base/trace_event/trace_event.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
@@ -98,6 +99,9 @@ SafeBrowsingResourceThrottle::SafeBrowsingResourceThrottle(
                                             NetLog::SOURCE_SAFE_BROWSING)) {}
 
 SafeBrowsingResourceThrottle::~SafeBrowsingResourceThrottle() {
+  TRACE_EVENT0("toplevel",
+               "SafeBrowsingResourceThrottle::~SafeBrowsingResourceThrottle");
+
   if (defer_state_ != DEFERRED_NONE) {
     EndNetLogEvent(NetLog::TYPE_SAFE_BROWSING_DEFERRED, nullptr, nullptr);
   }
@@ -132,6 +136,8 @@ void SafeBrowsingResourceThrottle::EndNetLogEvent(NetLog::EventType type,
 }
 
 void SafeBrowsingResourceThrottle::WillStartRequest(bool* defer) {
+  TRACE_EVENT0("toplevel", "SafeBrowsingResourceThrottle::WillStartRequest");
+
   // We need to check the new URL before starting the request.
   if (CheckUrl(request_->url()))
     return;
@@ -323,6 +329,7 @@ void SafeBrowsingResourceThrottle::OnBlockingPageComplete(bool proceed) {
 }
 
 bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
+  TRACE_EVENT0("toplevel", "SafeBrowsingResourceThrottle::CheckUrl");
   TRACE_EVENT1("loader", "SafeBrowsingResourceThrottle::CheckUrl", "url",
                url.spec());
   CHECK_EQ(state_, STATE_NONE);
@@ -334,7 +341,12 @@ bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
     return true;
   }
 
-  bool succeeded_synchronously = database_manager_->CheckBrowseUrl(url, this);
+  bool succeeded_synchronously;
+  {
+    TRACE_EVENT0("toplevel", "SafeBrowsingDatabaseManaager::CheckBrowseUrl");
+    succeeded_synchronously = database_manager_->CheckBrowseUrl(url, this);
+  }
+
   UMA_HISTOGRAM_ENUMERATION("SB2.ResourceTypes2.Checked", resource_type_,
                             content::RESOURCE_TYPE_LAST_TYPE);