Implement setSinkId() for media elements without src.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 3cb0fb9980f6bda86eb551f5ce36325cc58b321a..9b246b2ec7afc4941141adbfad5b7c93dd110771 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -78,6 +78,7 @@
 #include "content/renderer/ime_event_guard.h"
 #include "content/renderer/internal_document_state_data.h"
 #include "content/renderer/manifest/manifest_manager.h"
+#include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/media/crypto/render_cdm_factory.h"
 #include "content/renderer/media/media_permission_dispatcher_impl.h"
@@ -111,6 +112,7 @@
 #include "content/renderer/web_ui_extension.h"
 #include "content/renderer/websharedworker_proxy.h"
 #include "gin/modules/module_registry.h"
+#include "media/audio/audio_output_device.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "media/base/media_log.h"
 #include "media/blink/webencryptedmediaclient_impl.h"
@@ -5296,4 +5298,18 @@ mojo::ServiceProviderPtr RenderFrameImpl::ConnectToApplication(
   return service_provider.Pass();
 }
 
+void RenderFrameImpl::checkAudioSink(
+    const blink::WebString& sink_id,
+    const blink::WebSecurityOrigin& security_origin,
+    blink::WebSetSinkIdCallbacks* web_callback) {
+  scoped_refptr<media::AudioOutputDevice> device =
+      AudioDeviceFactory::NewOutputDevice(routing_id_, 0, sink_id.utf8(),
+                                          security_origin);
+  media::OutputDeviceStatus status = device->GetDeviceStatus();
+  device->Stop();
+  media::SwitchOutputDeviceCB callback =
+      media::ConvertToSwitchOutputDeviceCB(web_callback);
+  callback.Run(status);
+}
+
 }  // namespace content