Add constructors for WebAudio nodes

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/webaudio/StereoPannerNode.h"
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #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"
 
 namespace blink {
 
 StereoPannerHandler::StereoPannerHandler(AudioNode& node, float sampleRate, AudioParamHandler& pan)
     : AudioHandler(NodeTypeStereoPanner, node, sampleRate)
     , m_pan(pan)
     , m_sampleAccuratePanValues(ProcessingSizeInFrames)
 {
@@ skipping 123 matching lines @@
     DCHECK(isMainThread());
 
     if (context.isContextClosed()) {
         context.throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return new StereoPannerNode(context);
 }
 
+StereoPannerNode* StereoPannerNode::create(BaseAudioContext* context, const StereoPannerOptions& options, ExceptionState& exceptionState)
+{
+    StereoPannerNode* node = create(*context, exceptionState);
+
+    if (!node)
+        return node;

[hongchan, 2016/09/12 18:56:32]

return nullptr;

+
+    node->handleChannelOptions(options, exceptionState);
+
+    if (options.hasPan())
+        node->pan()->setValue(options.pan());
+
+    return node;
+}
+
 DEFINE_TRACE(StereoPannerNode)
 {
     visitor->trace(m_pan);
     AudioNode::trace(visitor);
 }
 
 AudioParam* StereoPannerNode::pan() const
 {
     return m_pan;
 }
 
 } // namespace blink