Add constructors for WebAudio nodes

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

Index: third_party/WebKit/Source/modules/webaudio/StereoPannerNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/StereoPannerNode.cpp b/third_party/WebKit/Source/modules/webaudio/StereoPannerNode.cpp
index 7389fc222e3dad7fcec41884bce779c6e6c3cd8c..d2d52f8bd52173c6858ad65a4f22572f8e9f8820 100644
--- a/third_party/WebKit/Source/modules/webaudio/StereoPannerNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/StereoPannerNode.cpp
@@ -10,6 +10,7 @@
 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BaseAudioContext.h"
+#include "modules/webaudio/StereoPannerOptions.h"
 #include "platform/audio/StereoPanner.h"
 #include "wtf/MathExtras.h"
 
@@ -153,6 +154,21 @@ StereoPannerNode* StereoPannerNode::create(BaseAudioContext& context, ExceptionS
     return new StereoPannerNode(context);
 }
 
+StereoPannerNode* StereoPannerNode::create(BaseAudioContext* context, const StereoPannerOptions& options, ExceptionState& exceptionState)
+{
+    StereoPannerNode* node = create(*context, exceptionState);
+
+    if (!node)
+        return node;
+
+    node->handleChannelOptions(options, exceptionState);
+
+    if (options.hasPan())
+        node->pan()->setValue(options.pan());
+
+    return node;
+}
+
 DEFINE_TRACE(StereoPannerNode)
 {
     visitor->trace(m_pan);