Add constructors for WebAudio nodes

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

Index: third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp b/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
index 211dfb09800b93f12823587a7c0fb0b660efeedb..729e4b0f89115c03dedd1d3745636e8df8ff0259 100644
--- a/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
@@ -29,6 +29,7 @@
 #include "core/inspector/ConsoleMessage.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BaseAudioContext.h"
+#include "modules/webaudio/MediaElementAudioSourceOptions.h"
 #include "platform/audio/AudioUtilities.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/Locker.h"
@@ -235,6 +236,18 @@ MediaElementAudioSourceNode* MediaElementAudioSourceNode::create(BaseAudioContex
     return node;
 }
 
+MediaElementAudioSourceNode* MediaElementAudioSourceNode::create(BaseAudioContext* context, const MediaElementAudioSourceOptions& options, ExceptionState& exceptionState)
+{
+    if (!options.hasMediaElement()) {
+        exceptionState.throwDOMException(
+            NotFoundError,
+            "mediaElement member is required.");
+        return nullptr;
+    }
+
+    return create(*context, *options.mediaElement(), exceptionState);
+}
+
 DEFINE_TRACE(MediaElementAudioSourceNode)
 {
     AudioSourceProviderClient::trace(visitor);