Get rid of gpu related switches by passing gpu::GpuPreferences via IPC.

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',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_surfaces',
     '../components/mime_util/mime_util.gyp:mime_util',
@@ skipping 167 matching lines @@
       'public/browser/favicon_status.h',
       'public/browser/file_descriptor_info.h',
       'public/browser/focused_node_details.h',
       'public/browser/font_list_async.h',
       'public/browser/geolocation_provider.h',
       'public/browser/global_request_id.h',
       'public/browser/gpu_data_manager.h',
       'public/browser/gpu_data_manager_observer.h',
       'public/browser/gpu_service_registry.cc',
       'public/browser/gpu_service_registry.h',
+      'public/browser/gpu_utils.cc',
+      'public/browser/gpu_utils.h',
       'public/browser/histogram_fetcher.h',
       'public/browser/host_zoom_map.h',
       'public/browser/indexed_db_context.h',
       'public/browser/indexed_db_info.h',
       'public/browser/interstitial_page.h',
       'public/browser/interstitial_page_delegate.cc',
       'public/browser/interstitial_page_delegate.h',
       'public/browser/invalidate_type.h',
       'public/browser/javascript_dialog_manager.cc',
       'public/browser/javascript_dialog_manager.h',
@@ skipping 1998 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }