Define default values for options dictionaries for WebAudio

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"
@@ skipping 150 matching lines @@
 StereoPannerNode* StereoPannerNode::Create(BaseAudioContext* context,
                                            const StereoPannerOptions& options,
                                            ExceptionState& exception_state) {
   StereoPannerNode* node = Create(*context, exception_state);
 
   if (!node)
     return nullptr;
 
   node->HandleChannelOptions(options, exception_state);
 
-  if (options.hasPan())
-    node->pan()->setValue(options.pan());
+  node->pan()->setValue(options.pan());
 
   return node;
 }
 
 DEFINE_TRACE(StereoPannerNode) {
   visitor->Trace(pan_);
   AudioNode::Trace(visitor);
 }
 
 AudioParam* StereoPannerNode::pan() const {
   return pan_;
 }
 
 }  // namespace blink