Centralize ScreenOrientationProvider logic, add platform delegates

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',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 173 matching lines @@
       'public/browser/resource_dispatcher_host.h',
       'public/browser/resource_dispatcher_host_delegate.cc',
       'public/browser/resource_dispatcher_host_delegate.h',
       'public/browser/resource_dispatcher_host_login_delegate.h',
       'public/browser/resource_request_details.cc',
       'public/browser/resource_request_details.h',
       'public/browser/resource_request_info.h',
       'public/browser/resource_throttle.h',
       'public/browser/save_page_type.h',
       'public/browser/screen_orientation_dispatcher_host.h',
+      'public/browser/screen_orientation_provider.cc',
       'public/browser/screen_orientation_provider.h',
+      'public/browser/screen_orientation_provider_factory.h',
       'public/browser/service_worker_context.h',
       'public/browser/service_worker_usage_info.cc',
       'public/browser/service_worker_usage_info.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',
@@ skipping 1670 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }