Move app launch metric recording code from NTP to chrome/common.

chrome/chrome_common.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 149 matching lines @@
       'common/extensions/chrome_extensions_client.h',
       'common/extensions/chrome_manifest_handlers.cc',
       'common/extensions/chrome_manifest_handlers.h',
       'common/extensions/chrome_manifest_url_handlers.cc',
       'common/extensions/chrome_manifest_url_handlers.h',
       'common/extensions/chrome_utility_extensions_messages.h',
       'common/extensions/command.cc',
       'common/extensions/command.h',
       'common/extensions/extension_constants.cc',
       'common/extensions/extension_constants.h',
+      'common/extensions/extension_metrics.cc',
+      'common/extensions/extension_metrics.h',
       'common/extensions/extension_process_policy.cc',
       'common/extensions/extension_process_policy.h',
       'common/extensions/features/chrome_channel_feature_filter.cc',
       'common/extensions/features/chrome_channel_feature_filter.h',
       'common/extensions/features/feature_channel.cc',
       'common/extensions/features/feature_channel.h',
       'common/extensions/image_writer/image_writer_util_mac.cc',
       'common/extensions/image_writer/image_writer_util_mac.h',
       'common/extensions/manifest_handlers/app_isolation_info.cc',
       'common/extensions/manifest_handlers/app_isolation_info.h',
@@ skipping 494 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }