Add mojo interface for audio rendering.

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 5299efe7794b19241204fbc1ecaf68ee281732eb..b7d4c60d92a153b14897785d5c442eeb71187894 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -176,6 +176,10 @@ const base::Feature kVideoColorManagement{"video-color-management",
 const base::Feature kVideoBlitColorAccuracy{"video-blit-color-accuracy",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Use mojo rather than Chrome IPC for audio output stream control.
+const base::Feature kMojoAudioOutputStreamControl{
+    "mojo-audio-output-stream-control", base::FEATURE_DISABLED_BY_DEFAULT};

[o1ka, 2017/01/25 15:15:21]

Can we land the unhooked code with unit tests first, and feature + factory
separately (the latter requires a launch procedure)?

+
 // Enables support for External Clear Key (ECK) key system for testing on
 // supported platforms. On platforms that do not support ECK, this feature has
 // no effect.