IPC->mojo of audio_renderer_host

media/media_options.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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 declare_args() {
   # Allows distributions to link pulseaudio directly (DT_NEEDED) instead of
@@ skipping 59 matching lines @@
 declare_args() {
   # Experiment to enable mojo media services (e.g. "renderer", "cdm", see
   # |mojo_media_services|). When enabled, selected mojo paths will be enabled in
   # the media pipeline and corresponding services will hosted in the selected
   # remote process (e.g. "utility" process, see |mojo_media_host|).
   enable_mojo_media = is_android || (is_chromecast && !is_cast_desktop_build)
 
   # Enable the TestMojoMediaClient to be used in MojoMediaApplication. This is
   # for testing only and will override the default platform MojoMediaClient.
   enable_test_mojo_media_client = false
+
+  # Used to enable mojo WebAudio rendering service.
+  enable_mojo_audio = true
 }
 
 # Use a second declare_args() to pick up possible overrides of enable_mojo_media
 # from --args command line flags. See "gn help declare_args".
 declare_args() {
   # A list of mojo media services that should be used in the media pipeline.
   # Must not be empty if |enable_mojo_media| is true.
   # Valid entries in the list are:
   # - "renderer": Use mojo-based media Renderer service.
   # - "cdm": Use mojo-based Content Decryption Module.
@@ skipping 25 matching lines @@
       mojo_media_services = [
         "cdm",
         "renderer",
       ]
       mojo_media_host = "browser"
     } else {
       mojo_media_services = [ "video_decoder" ]
       mojo_media_host = "gpu"
     }
   }
+
+  # The process to host the mojo audio application.
+  # Valid options are:
+  # - "none": Do not use mojo audio application.
+  # - "browser": Use mojo audio application hosted in the browser process.
+  # - "gpu": Use mojo audio application hosted in the gpu process.

[o1ka, 2016/09/02 07:31:46]

Where does this list of options come from?

+  # - "utility": Use mojo audio application hosted in the utility process.
+  mojo_audio_host = "none"
+
+  if (enable_mojo_audio) {
+    mojo_audio_host = "browser"
+  }
 }
+
+if (enable_mojo_audio) {
+  assert(mojo_audio_host == "browser",
+         "Mojo audio not supported outside browser process.")
+} else {
+  assert(mojo_audio_host == "none", "Mojo audio is not enabled.")
+}