Add constructors for WebAudio nodes

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

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 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/UseCounter.h"
 #include "modules/webaudio/AudioBufferSourceNode.h"
+#include "modules/webaudio/AudioBufferSourceOptions.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BaseAudioContext.h"
 #include "platform/FloatConversion.h"
 #include "platform/audio/AudioUtilities.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PtrUtil.h"
 #include <algorithm>
 
 namespace blink {
 
@@ skipping 567 matching lines @@
     DCHECK(isMainThread());
 
     if (context.isContextClosed()) {
         context.throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return new AudioBufferSourceNode(context);
 }
 
+AudioBufferSourceNode* AudioBufferSourceNode::create(BaseAudioContext* context, AudioBufferSourceOptions& options, ExceptionState& exceptionState)
+{

[hongchan, 2016/09/08 21:41:11]

I prefer to have a DCHECK here.

[Raymond Toy, 2016/09/08 21:58:00]

DCHECK what?

+    AudioBufferSourceNode* node = create(*context, exceptionState);
+
+    if (!node)
+        return node;

[hongchan, 2016/09/08 21:41:11]

nullptr?

+
+    if (options.hasBuffer())
+        node->setBuffer(options.buffer(), exceptionState);
+    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());
+
+    return node;
+}
+
 DEFINE_TRACE(AudioBufferSourceNode)
 {
     visitor->trace(m_playbackRate);
     visitor->trace(m_detune);
     AudioScheduledSourceNode::trace(visitor);
 }
 
 AudioBufferSourceHandler& AudioBufferSourceNode::audioBufferSourceHandler() const
 {
     return static_cast<AudioBufferSourceHandler&>(handler());
@@ skipping 63 matching lines @@
 {
     audioBufferSourceHandler().start(when, grainOffset, exceptionState);
 }
 
 void AudioBufferSourceNode::start(double when, double grainOffset, double grainDuration, ExceptionState& exceptionState)
 {
     audioBufferSourceHandler().start(when, grainOffset, grainDuration, exceptionState);
 }
 
 } // namespace blink