Add is_chromecast to GN build.

build/config/features.gni

 # 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.
 
 # This file contains Chrome-feature-related build flags (see ui.gni for
 # UI-related ones). These should theoretically be moved to the build files of
 # the features themselves.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global to match the GYP configuration. Also,
 # anything that needs a grit define must be in either this file or ui.gni.
 #
 # PLEASE TRY TO AVOID ADDING FLAGS TO THIS FILE in cases where grit isn't
 # required. See the declare_args block of BUILDCONFIG.gn for advice on how
 # to set up feature flags.
 
 import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 declare_args() {
   # Multicast DNS.
   enable_mdns = is_win || is_linux
 
-  enable_plugins = !is_android && !is_ios
-  enable_pdf = !is_android && !is_ios
+  enable_plugins = (!is_android && !is_ios) || is_chromecast
+  enable_pdf = !is_android && !is_ios && !is_chromecast
 
   # Enables Native Client support.
   # TODO(GYP): Get NaCl linking on other platforms.
   # Also, see if we can always get rid of enable_nacl_untrusted and
   # enable_pnacl and always build them if enable_nacl is true.
   # The "is_nacl" part of the condition is needed to ensure that
   # the untrusted code is built properly; arguably it should be
   # guarded by "is_nacl" directly rather than enable_nacl_untrusted, but
   # this will go away when Mac and Win are working and we can just use
   # the commented out logic.
@@ skipping 13 matching lines @@
   # TODO(GYP) make mac and android work.
   enable_webrtc = !is_ios && !is_mac && !is_android
 
   # Enables the Media Router.
   enable_media_router = !is_ios
 
   # Enables proprietary codecs and demuxers; e.g. H264, MOV, AAC, and MP3.
   # Android OS includes support for proprietary codecs regardless of building
   # Chromium or Google Chrome. We also ship Google Chrome and Chromecast with
   # proprietary codecs.
-  # TODO(GYP) The GYP build has || chromecast==1 for this:
-  proprietary_codecs = is_android || is_chrome_branded
+  proprietary_codecs = is_android || is_chrome_branded || is_chromecast
 
   # TODO(GYP) This should be enabled on ios as well.
   enable_configuration_policy = !is_ios
 
   # Enables support for background apps.
   enable_background = !is_ios && !is_android
 
   enable_captive_portal_detection = !is_android && !is_ios
 
   # Enables use of the session service, which is enabled by default.
   # Android stores them separately on the Java side.
   enable_session_service = !is_android && !is_ios
 
   enable_plugin_installation = is_win || is_mac
 
   enable_app_list = !is_ios && !is_android
 
   enable_supervised_users = !is_ios
 
   enable_autofill_dialog = !is_ios
 
   enable_google_now = !is_ios && !is_android
 
   enable_one_click_signin = is_win || is_mac || (is_linux && !is_chromeos)
 
-  enable_remoting = !is_ios && !is_android
+  enable_remoting = !is_ios && !is_android && !is_chromecast
 
   # Enable hole punching for the protected video.
-  enable_video_hole = is_android
+  enable_video_hole = is_android || is_chromecast
 
   # Enables browser side Content Decryption Modules. Required for embedders
   # (e.g. Android and ChromeCast) that use a browser side CDM.
-  enable_browser_cdms = is_android
+  enable_browser_cdms = is_android || is_chromecast
 
   # Hangout services is an extension that adds extra features to Hangouts.
   # For official GYP builds, this flag is set.
   enable_hangout_services_extension = false
 
   # Enables the use of CDMs in pepper plugins. Chromecast requires that this
   # can be explicitly disabled in gn args.

[gunsch, 2015/09/16 04:41:48]

note: this was raised to declare_args due to this comment, could potentially get
dropped outside declare_args now

[slan, 2015/09/16 16:13:08]

Thanks for the reminder. Dropping this into local scope, essentially reverting
https://codereview.chromium.org/1266693005/.

-  enable_pepper_cdms = enable_plugins && (is_linux || is_mac || is_win)
+  enable_pepper_cdms =
+      enable_plugins && (is_linux || is_mac || is_win) && !is_chromecast
 
   # Variable safe_browsing is used to control the build time configuration
   # for safe browsing feature. Safe browsing can be compiled in 4 different
   # levels: 0 disables it, 1 enables it fully, and 2 enables only UI and
   # reporting features for use with Data Saver on Mobile, and 3 enables
   # extended mobile protection via an external API.  When 3 is fully deployed,
   # it will replace 2.
   if (is_android) {
     safe_browsing_mode = 2
   } else if (is_ios) {
@@ skipping 15 matching lines @@
 #   2: Use only CLD2.
 cld_version = 2
 
 if (is_android || is_ios) {
   cld2_table_size = 0  # Small, accurate tables
 } else {
   cld2_table_size = 2  # Larger, more accurate tables
 }
 
 # libudev usage. This currently only affects the content layer.
-use_udev = is_linux
+use_udev = is_linux && !is_chromecast
 
 # Enable the spell checker.
 enable_spellcheck = !is_ios
 
 # Use the operating system's spellchecker rather than hunspell.
 use_browser_spellchecker = is_android || is_mac
 
 # Enable basic printing support and UI.
-enable_basic_printing = !is_chromeos
+enable_basic_printing = !is_chromeos && !is_chromecast
 
 # Enable printing with print preview. It does not imply
 # enable_basic_printing. It's possible to build Chrome with preview only.
-enable_print_preview = !is_android
+enable_print_preview = !is_android && !is_chromecast
 
 # The seccomp-bpf sandbox is only supported on three architectures
 # currently.
 # Do not disable seccomp_bpf anywhere without talking to
 # security@chromium.org!
 use_seccomp_bpf = (is_linux || is_android) &&
                   (current_cpu == "x86" || current_cpu == "x64" ||
                    current_cpu == "arm" || current_cpu == "mipsel")
 
 # Enable notifications everywhere except iOS.
 enable_notifications = !is_ios
 
 # TODO(brettw) this should be moved to net and only dependents get this define.
 disable_ftp_support = is_ios
 
 enable_web_speech = !is_android && !is_ios
 
-use_dbus = is_linux
+use_dbus = is_linux && !is_chromecast
 
 enable_extensions = !is_android && !is_ios
 
 enable_task_manager = !is_ios && !is_android
 
-use_cups = is_desktop_linux || is_mac
+use_cups = (is_desktop_linux || is_mac) && !is_chromecast
 
 enable_themes = !is_android && !is_ios
 
 # TODO(scottmg) remove this when we've fixed printing.
 win_pdf_metafile_for_printing = true
 
 # Whether we are using the rlz library or not.  Platforms like Android send
 # rlz codes for searches but do not use the library.
 enable_rlz_support = is_win || is_mac || is_ios || is_chromeos
 enable_rlz = is_chrome_branded && enable_rlz_support
 
 enable_settings_app = enable_app_list && !is_chromeos
 
 enable_service_discovery = enable_mdns || is_mac
 
 enable_wifi_bootstrapping = is_win || is_mac
 
 # Image loader extension is enabled on ChromeOS only.
 enable_image_loader_extension = is_chromeos
 
 # Chrome OS: whether to also build the upcoming version of
 # ChromeVox, which can then be enabled via a command-line switch.
 enable_chromevox_next = false
 
 # Use brlapi from brltty for braille display support.
 use_brlapi = is_chromeos
 
 # Option controlling the use of GConf (the classic GNOME configuration
 # system).
-# TODO(GYP) also require !embedded to enable.
-use_gconf = is_linux && !is_chromeos
+use_gconf = is_linux && !is_chromeos && !is_chromecast
 
 # Whether to back up data before sync.
 enable_pre_sync_backup = is_win || is_mac || (is_linux && !is_chromeos)
 
 # Enable WebVR support by default on Android
 # Still requires command line flag to access API
 enable_webvr = is_android