Define default values for options dictionaries for WebAudio

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

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 660 matching lines @@
     ExceptionState& exception_state) {
   DCHECK(IsMainThread());
 
   AudioBufferSourceNode* node = Create(*context, exception_state);
 
   if (!node)
     return nullptr;
 
   if (options.hasBuffer())
     node->setBuffer(options.buffer(), exception_state);
-  if (options.hasDetune())
-    node->detune()->setValue(options.detune());
-  if (options.hasLoop())
-    node->setLoop(options.loop());
-  if (options.hasLoopEnd())
-    node->setLoopEnd(options.loopEnd());
-  if (options.hasLoopStart())
-    node->setLoopStart(options.loopStart());
-  if (options.hasPlaybackRate())
-    node->playbackRate()->setValue(options.playbackRate());
+  node->detune()->setValue(options.detune());
+  node->setLoop(options.loop());
+  node->setLoopEnd(options.loopEnd());
+  node->setLoopStart(options.loopStart());
+  node->playbackRate()->setValue(options.playbackRate());
 
   return node;
 }
 
 DEFINE_TRACE(AudioBufferSourceNode) {
   visitor->Trace(playback_rate_);
   visitor->Trace(detune_);
   AudioScheduledSourceNode::Trace(visitor);
 }
 
@@ skipping 60 matching lines @@
 
 void AudioBufferSourceNode::start(double when,
                                   double grain_offset,
                                   double grain_duration,
                                   ExceptionState& exception_state) {
   GetAudioBufferSourceHandler().Start(when, grain_offset, grain_duration,
                                       exception_state);
 }
 
 }  // namespace blink