[Chromecast] Allow |enable_pepper_cdms| to be set in gn args.

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,
@@ skipping 75 matching lines @@
 
   enable_remoting = !is_ios && !is_android
 
   # Enable hole punching for the protected video.
   enable_video_hole = is_android
 
   # 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
 
+  # Enables the use of CDMs in pepper plugins. Chromecast requires that this
+  # can be explicitly disabled in gn args.
+  enable_pepper_cdms = enable_plugins && (is_linux || is_mac || is_win)
+
   # 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) {
     safe_browsing_mode = 0
@@ skipping 16 matching lines @@
 
 # libudev usage. This currently only affects the content layer.
 use_udev = is_linux
 
 # Enable the spell checker.
 enable_spellcheck = !is_ios
 
 # Use the operating system's spellchecker rather than hunspell.
 use_platform_spellchecker = is_android || is_mac
 
-enable_pepper_cdms = enable_plugins && (is_linux || is_mac || is_win)
-
 # Enable basic printing support and UI.
 enable_basic_printing = !is_chromeos
 
 # 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
 
 # The seccomp-bpf sandbox is only supported on three architectures
 # currently.
 # Do not disable seccomp_bpf anywhere without talking to
@@ skipping 52 matching lines @@
 # Hangout services is an extension that adds extra features to Hangouts.
 # For official GYP builds, this flag is set, it will likely need to be
 # parameterized in the future for a similar use.
 enable_hangout_services_extension = false
 
 # Whether to back up data before sync.
 enable_pre_sync_backup = is_win || is_mac || (is_linux && !is_chromeos)
 
 # WebVR support disabled until platform implementations have been added
 enable_webvr = false