Adding instrumentation to locate the source of jankiness.

chrome/common/chrome_version_info_win.cc

 // Copyright (c) 2011 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/common/chrome_version_info.h"
 
 #include "base/base_paths.h"
 #include "base/debug/profiler.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "chrome/installer/util/install_util.h"
 
 namespace chrome {
 
 // static
 std::string VersionInfo::GetVersionStringModifier() {
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 VersionInfo::GetVersionStringModifier"));
+
 #if defined(GOOGLE_CHROME_BUILD)
   base::FilePath module;
   base::string16 channel;
   if (PathService::Get(base::FILE_MODULE, &module)) {
     bool is_system_install =
         !InstallUtil::IsPerUserInstall(module.value().c_str());
 
     GoogleUpdateSettings::GetChromeChannelAndModifiers(is_system_install,
                                                        &channel);
   }
@@ skipping 27 matching lines @@
     return CHANNEL_DEV;
   } else if (channel == L"canary") {
     return CHANNEL_CANARY;
   }
 #endif
 
   return CHANNEL_UNKNOWN;
 }
 
 }  // namespace chrome