Use only headless Ozone on Cast audio-only platforms

chromecast/BUILD.gn

 # Copyright 2015 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/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//chromecast/build/tests/cast_test.gni")
@@ skipping 67 matching lines @@
     filters += [ cast_media_unittests_filter ]
 
     cast_shell_browsertests_filter = {
       test_name = "cast_shell_browsertests"
 
       # --enable-local-file-accesses => to load sample media files
       # --test-launcher-jobs=1 => so internal code can bind to port
       args = [
         "--no-sandbox",
         "--enable-local-file-accesses",
-        "--ozone-platform=cast",
         "--test-launcher-jobs=1",
       ]
+      if (is_cast_audio_only) {
+        args += [ "--ozone-platform=headless" ]
+      } else {
+        args += [ "--ozone-platform=cast" ]
+      }
       if (!is_cast_desktop_build) {
         args += [ "--use-gpu-in-tests" ]
 
         # TODO(derekjchow): Make these tests pass on Chromecast devices.
         #    Once all of the CastMediaBlockerTest.* have been un-DISABLEd and
         #    are running successfully, revisit these tests and see if they pass
         #    on devices. (crbug/665118, internal b/32023194)
         gtest_excludes = [
           "CastMediaBlockerBrowserTest.Video_BlockUnblock",
           "CastMediaBlockerBrowserTest.Audio_BlockUnblock",
@@ skipping 349 matching lines @@
     shared_libraries = [ "//chromecast/android:libcast_shell_android" ]
 
     deps = [
       ":cast_shell_apk_assets",
       "//base:base_java",
       "//chromecast/android:libcast_shell_android",
       "//chromecast/browser/android:cast_shell_java",
     ]
   }
 }