Add constructors for WebAudio nodes

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

Index: third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
index 38bf3bcb481863a13eeaa88f52b683381e95f858..d82e5297ef2488d2cd4e94c9e9dddafa18673d5d 100644
--- a/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
@@ -9,6 +9,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "modules/webaudio/AudioBasicProcessorHandler.h"
 #include "modules/webaudio/BaseAudioContext.h"
+#include "modules/webaudio/IIRFilterOptions.h"
 #include "platform/Histogram.h"
 #include "wtf/PtrUtil.h"
 
@@ -117,6 +118,35 @@ IIRFilterNode* IIRFilterNode::create(
     return new IIRFilterNode(context, feedforwardCoef, feedbackCoef);
 }
 
+IIRFilterNode* IIRFilterNode::create(
+    BaseAudioContext* context,
+    const IIRFilterOptions& options,
+    ExceptionState& exceptionState)
+{
+    if (!options.hasFeedforward()) {
+        exceptionState.throwDOMException(
+            NotFoundError,
+            "IIRFilterOptions: feedforward is required.");
+        return nullptr;
+    }
+
+    if (!options.hasFeedback()) {
+        exceptionState.throwDOMException(
+            NotFoundError,
+            "IIRFilterOptions: feedback is required.");
+        return nullptr;
+    }
+
+    IIRFilterNode* node = create(*context, options.feedforward(), options.feedback(), exceptionState);
+
+    if (!node)
+        return nullptr;
+
+    node->handleChannelOptions(options, exceptionState);
+
+    return node;
+}
+
 DEFINE_TRACE(IIRFilterNode)
 {
     AudioNode::trace(visitor);