| Index: Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp | 
| diff --git a/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp b/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp | 
| index 6bd9fdd8898b7db783613b164cc20856687ecedc..be8d12d3809aa2d30125558c971a5792ca2eb8dc 100644 | 
| --- a/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp | 
| +++ b/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp | 
| @@ -102,16 +102,24 @@ DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> va | 
|  | 
| void V8DeviceMotionEvent::initDeviceMotionEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) | 
| { | 
| +    ExceptionState exceptionState(ExceptionState::ExecutionContext, "initDeviceMotionEvent", "DeviceMotionEvent", info.Holder(), info.GetIsolate()); | 
| DeviceMotionEvent* impl = V8DeviceMotionEvent::toImpl(info.Holder()); | 
| v8::Isolate* isolate = info.GetIsolate(); | 
| -    TOSTRING_VOID(V8StringResource<>, type, info[0]); | 
| +    V8StringResource<> type(info[0]); | 
| +    if (!type.prepare()) | 
| +        return; | 
| bool bubbles = info[1]->BooleanValue(); | 
| bool cancelable = info[2]->BooleanValue(); | 
| DeviceMotionData::Acceleration* acceleration = readAccelerationArgument(info[3], isolate); | 
| DeviceMotionData::Acceleration* accelerationIncludingGravity = readAccelerationArgument(info[4], isolate); | 
| DeviceMotionData::RotationRate* rotationRate = readRotationRateArgument(info[5], isolate); | 
| bool intervalProvided = !isUndefinedOrNull(info[6]); | 
| -    double interval = info[6]->NumberValue(); | 
| +    double interval = 0; | 
| +    if (intervalProvided) { | 
| +        interval = toRestrictedDouble(info[6], exceptionState); | 
| +        if (exceptionState.throwIfNeeded()) | 
| +            return; | 
| +    } | 
| DeviceMotionData* deviceMotionData = DeviceMotionData::create(acceleration, accelerationIncludingGravity, rotationRate, intervalProvided, interval); | 
| impl->initDeviceMotionEvent(type, bubbles, cancelable, deviceMotionData); | 
| } | 
|  |