Change Lo-Fi bool to bitmask to support multiple Previews types

content/public/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 158 matching lines @@
     "page_state.h",
     "page_type.h",
     "page_zoom.h",
     "pepper_plugin_info.cc",
     "pepper_plugin_info.h",
     "persistent_notification_status.h",
     "platform_notification_data.cc",
     "platform_notification_data.h",
     "presentation_constants.cc",
     "presentation_constants.h",
+    "previews_state.h",
     "process_type.h",
     "push_messaging_status.cc",
     "push_messaging_status.h",
     "quarantine.h",
     "referrer.cc",
     "referrer.h",
     "renderer_preferences.cc",
     "renderer_preferences.h",
     "request_context_frame_type.h",
     "request_context_type.h",
@@ skipping 131 matching lines @@
   sources = [
     "window_container_type.mojom",
   ]
 }
 
 mojom("service_names") {
   sources = [
     "service_names.mojom",
   ]
 }