Add constructor for MediaStreamAudioSourceNode

third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp

Index: third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp b/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp
index 988f54479fd6fc30ca05cbb5c6e4faec252bb551..89a0541e38898a701ac1df66708aaa15ef6fcc0f 100644
--- a/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioSourceNode.cpp
@@ -28,6 +28,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BaseAudioContext.h"
+#include "modules/webaudio/MediaStreamAudioSourceOptions.h"
 #include "wtf/Locker.h"
 #include <memory>
 
@@ -171,6 +172,13 @@ MediaStreamAudioSourceNode* MediaStreamAudioSourceNode::create(
   return node;
 }
 
+MediaStreamAudioSourceNode* MediaStreamAudioSourceNode::create(
+    BaseAudioContext* context,
+    const MediaStreamAudioSourceOptions& options,
+    ExceptionState& exceptionState) {
+  return create(*context, *options.mediaStream(), exceptionState);
+}
+
 DEFINE_TRACE(MediaStreamAudioSourceNode) {
   AudioSourceProviderClient::trace(visitor);
   AudioSourceNode::trace(visitor);