bindings: Use V8 MaybeLocal APIs in V8DeviceMotionEventCustom

Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp

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 be8d12d3809aa2d30125558c971a5792ca2eb8dc..20b7077a17e2e20095f9603bc7ba179c208eeee4 100644
--- a/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
+++ b/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
@@ -34,13 +34,13 @@ namespace blink {
 
 namespace {
 
-DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
+DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    CALL_V8_MAYBELOCAL(object, isolate, value->ToObject(isolate->GetCurrentContext()), exceptionState, nullptr);
 
     v8::Local<v8::Value> xValue = object->Get(v8AtomicString(isolate, "x"));
     if (xValue.IsEmpty())
@@ -66,13 +66,13 @@ DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> va
     return DeviceMotionData::Acceleration::create(canProvideX, x, canProvideY, y, canProvideZ, z);
 }
 
-DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
+DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    CALL_V8_MAYBELOCAL(object, isolate, value->ToObject(isolate->GetCurrentContext()), exceptionState, nullptr);
 
     v8::Local<v8::Value> alphaValue = object->Get(v8AtomicString(isolate, "alpha"));
     if (alphaValue.IsEmpty())
@@ -110,9 +110,12 @@ void V8DeviceMotionEvent::initDeviceMotionEventMethodCustom(const v8::FunctionCa
         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);
+    DeviceMotionData::Acceleration* acceleration = readAccelerationArgument(info[3], isolate, exceptionState);
+    DeviceMotionData::Acceleration* accelerationIncludingGravity = readAccelerationArgument(info[4], isolate, exceptionState);
+    DeviceMotionData::RotationRate* rotationRate = readRotationRateArgument(info[5], isolate, exceptionState);
+    if (exceptionState.throwIfNeeded())
+        return;
+
     bool intervalProvided = !isUndefinedOrNull(info[6]);
     double interval = 0;
     if (intervalProvided) {