| Index: third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp | 
| diff --git a/third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp b/third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp | 
| index b62f8244ce254e74767da1609ebf8843b84d99a3..ed38aa2aa579d291a4b84dc3d4f14ffeb03d3edb 100644 | 
| --- a/third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp | 
| +++ b/third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp | 
| @@ -327,6 +327,7 @@ void OscillatorHandler::process(size_t framesToProcess) | 
| void OscillatorHandler::setPeriodicWave(PeriodicWave* periodicWave) | 
| { | 
| ASSERT(isMainThread()); | 
| +    ASSERT(periodicWave); | 
|  | 
| // This synchronizes with process(). | 
| MutexLocker processLocker(m_processLock); | 
|  |