bluetooth: Move histogram related code to its own file

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',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 468 matching lines @@
       'browser/background_sync/background_sync_registration.h',
       'browser/background_sync/background_sync_registration_options.cc',
       'browser/background_sync/background_sync_registration_options.h',
       'browser/background_sync/background_sync_service_impl.cc',
       'browser/background_sync/background_sync_service_impl.h',
       'browser/background_sync/background_sync_status.h',
       'browser/bad_message.cc',
       'browser/bad_message.h',
       'browser/bluetooth/bluetooth_dispatcher_host.cc',
       'browser/bluetooth/bluetooth_dispatcher_host.h',
+      'browser/bluetooth/bluetooth_metrics.cc',
+      'browser/bluetooth/bluetooth_metrics.h',
       'browser/bootstrap_sandbox_mac.cc',
       'browser/bootstrap_sandbox_mac.h',
       'browser/browser_child_process_host_impl.cc',
       'browser/browser_child_process_host_impl.h',
       'browser/browser_context.cc',
       'browser/browser_io_surface_manager_mac.cc',
       'browser/browser_io_surface_manager_mac.h',
       'browser/browser_ipc_logging.cc',
       'browser/browser_main.cc',
       'browser/browser_main.h',
@@ skipping 1643 matching lines @@
       'sources': [
         'browser/vr/vr_device.cc',
         'browser/vr/vr_device.h',
         'browser/vr/vr_device_manager.cc',
         'browser/vr/vr_device_manager.h',
         'browser/vr/vr_device_provider.h',
       ]
     }],
   ],
 }