[Merge M48] Add Startup.TimeSinceLastStartup histogram.

components/startup_metric_utils.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'startup_metric_utils_browser',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../base/base.gyp:base_prefs',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'startup_metric_utils/browser/startup_metric_utils.cc',
         'startup_metric_utils/browser/startup_metric_utils.h',
       ],
     },
   ],
 }