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.
 
 # We have 2 separate browser targets because //components/html_viewer requires
 # startup_metric_utils_browser, but has symbols that conflict with mojo symbols
 # that startup_metric_utils_browser_message_filter indirectly depends on.
 
 {
   'targets': [
     {
       # GN version: //components/startup_metric_utils/browser:lib
       'target_name': 'startup_metric_utils_browser',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../base/base.gyp:base_prefs',
         'components.gyp:variations',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'startup_metric_utils/browser/pre_read_field_trial_utils_win.cc',
         'startup_metric_utils/browser/pre_read_field_trial_utils_win.h',
         'startup_metric_utils/browser/startup_metric_utils.cc',
         'startup_metric_utils/browser/startup_metric_utils.h',
@@ skipping 29 matching lines @@
         '..',
       ],
       'sources': [
         'startup_metric_utils/common/startup_metric_message_generator.cc',
         'startup_metric_utils/common/startup_metric_message_generator.h',
         'startup_metric_utils/common/startup_metric_messages.h',
       ],
     },
   ],
 }