[Sessions] Add detailed logging of SessionRestore events.

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../device/vibration/vibration.gyp:device_vibration',
     '../device/vibration/vibration.gyp:device_vibration_mojo_bindings',
@@ skipping 208 matching lines @@
       'public/browser/resource_request_info.h',
       'public/browser/resource_throttle.h',
       'public/browser/save_page_type.h',
       'public/browser/screen_orientation_delegate.h',
       'public/browser/screen_orientation_dispatcher_host.h',
       'public/browser/screen_orientation_provider.cc',
       'public/browser/screen_orientation_provider.h',
       'public/browser/service_worker_context.h',
       'public/browser/service_worker_usage_info.cc',
       'public/browser/service_worker_usage_info.h',
+      'public/browser/session_restore_uma.cc',
+      'public/browser/session_restore_uma.h',
       'public/browser/session_storage_namespace.h',
       'public/browser/session_storage_usage_info.h',
       'public/browser/signed_certificate_timestamp_store.h',
       'public/browser/site_instance.h',
       'public/browser/speech_recognition_event_listener.h',
       'public/browser/speech_recognition_manager.h',
       'public/browser/speech_recognition_manager_delegate.h',
       'public/browser/speech_recognition_session_config.cc',
       'public/browser/speech_recognition_session_config.h',
       'public/browser/speech_recognition_session_context.cc',
@@ skipping 1797 matching lines @@
         'browser/media/media_web_contents_observer.h',
       ],
     }],
     ['OS == "linux" and use_openssl==1', {
       'dependencies': [
         '../third_party/boringssl/boringssl.gyp:boringssl',
       ],
     }],
   ],
 }