A11y setting: mono audio UI

chromeos/dbus/cras_audio_client.cc

Index: chromeos/dbus/cras_audio_client.cc
diff --git a/chromeos/dbus/cras_audio_client.cc b/chromeos/dbus/cras_audio_client.cc
index acb4bf7f0ff44ae3c73c9a1d259eece4ceb56352..f2ce0291f99a2b2dfc590817b55ee0dda2ebf4a6 100644
--- a/chromeos/dbus/cras_audio_client.cc
+++ b/chromeos/dbus/cras_audio_client.cc
@@ -186,6 +186,18 @@ class CrasAudioClientImpl : public CrasAudioClient {
                             dbus::ObjectProxy::EmptyResponseCallback());
   }
 
+  void SetGlobalOutputChannelRemix(int32_t channels,
+                                   const std::vector<double>& mixer) override {
+    dbus::MethodCall method_call(cras::kCrasControlInterface,
+                                 cras::kSetGlobalOutputChannelRemix);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendInt32(channels);
+    writer.AppendArrayOfDoubles(mixer.data(), mixer.size());
+    cras_proxy_->CallMethod(&method_call,
+                            dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+                            dbus::ObjectProxy::EmptyResponseCallback());
+  }
+
   void WaitForServiceToBeAvailable(
       const WaitForServiceToBeAvailableCallback& callback) override {
     cras_proxy_->WaitForServiceToBeAvailable(callback);