Add constructors for WebAudio nodes

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

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 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/webaudio/AudioBasicProcessorHandler.h"
 #include "modules/webaudio/DelayNode.h"
+#include "modules/webaudio/DelayOptions.h"
 #include "modules/webaudio/DelayProcessor.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
 
 const double maximumAllowedDelayTime = 180;
 
 DelayNode::DelayNode(BaseAudioContext& context, double maxDelayTime)
     : AudioNode(context)
@@ skipping 36 matching lines @@
                 0.0,
                 ExceptionMessages::ExclusiveBound,
                 maximumAllowedDelayTime,
                 ExceptionMessages::ExclusiveBound));
         return nullptr;
     }
 
     return new DelayNode(context, maxDelayTime);
 }
 
+DelayNode* DelayNode::create(BaseAudioContext* context, const DelayOptions& options, ExceptionState& exceptionState)
+{
+    // maxDelayTime has a default value specified.
+    DelayNode* node = create(*context, options.maxDelayTime(), exceptionState);
+
+    if (!node)
+        return node;

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

return nullptr;

+
+    node->handleChannelOptions(options, exceptionState);
+
+    if (options.hasDelayTime())
+        node->delayTime()->setValue(options.delayTime());
+
+    return node;
+}
+
 AudioParam* DelayNode::delayTime()
 {
     return m_delayTime;
 }
 
 DEFINE_TRACE(DelayNode)
 {
     visitor->trace(m_delayTime);
     AudioNode::trace(visitor);
 }
 
 } // namespace blink