Additional tracing and histogram in Extensions startup.

chrome/browser/extensions/install_verifier.cc

 // Copyright 2013 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 "chrome/browser/extensions/install_verifier.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
+#include "base/trace_event/trace_event.h"
 #include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/install_signer.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/common/content_switches.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
@@ skipping 171 matching lines @@
   // If an extension has no update url, our autoupdate code will ask the
   // webstore about it (to aid in migrating to the webstore from self-hosting
   // or sideloading based installs). So we want to do verification checks on
   // such extensions too so that we don't accidentally disable old installs of
   // extensions that did migrate to the webstore.
   return (ManifestURL::GetUpdateURL(&extension).is_empty() &&
           Manifest::IsAutoUpdateableLocation(extension.location()));
 }
 
 void InstallVerifier::Init() {
+  TRACE_EVENT0("browser,startup", "extensions::InstallVerifier::Init");
   UMA_HISTOGRAM_ENUMERATION("ExtensionInstallVerifier.ExperimentStatus",
                             GetExperimentStatus(), VERIFY_STATUS_MAX);
   UMA_HISTOGRAM_ENUMERATION("ExtensionInstallVerifier.ActualStatus",
                             GetStatus(), VERIFY_STATUS_MAX);
 
   const base::DictionaryValue* pref = prefs_->GetInstallSignature();
   if (pref) {
     scoped_ptr<InstallSignature> signature_from_prefs =
         InstallSignature::FromValue(*pref);
     if (!signature_from_prefs.get()) {
@@ skipping 413 matching lines @@
     }
 
     OnVerificationComplete(success, operation->type);
   }
 
   if (!operation_queue_.empty())
     BeginFetch();
 }
 
 }  // namespace extensions