Add constructors for WebAudio nodes

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

Index: third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp b/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
index d627cb86b4463237569e647c855e2bceadce2185..1d49d73c04288904d82bc72d2dbacaea4646bcfb 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
@@ -27,6 +27,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/inspector/InstanceCounters.h"
 #include "modules/webaudio/AudioNodeInput.h"
+#include "modules/webaudio/AudioNodeOptions.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/AudioParam.h"
 #include "modules/webaudio/BaseAudioContext.h"
@@ -592,6 +593,18 @@ DEFINE_TRACE(AudioNode)
     EventTargetWithInlineData::trace(visitor);
 }
 
+void AudioNode::handleChannelOptions(const AudioNodeOptions& options, ExceptionState& exceptionState)
+{
+    DCHECK(isMainThread());
+
+    if (options.hasChannelCount())
+        setChannelCount(options.channelCount(), exceptionState);
+    if (options.hasChannelCountMode())
+        setChannelCountMode(options.channelCountMode(), exceptionState);
+    if (options.hasChannelInterpretation())
+        setChannelInterpretation(options.channelInterpretation(), exceptionState);
+}
+
 BaseAudioContext* AudioNode::context() const
 {
     return m_context;