bindings: Use Maybe APIs in ScriptPromise

Source/bindings/core/v8/ScriptValue.h

 /*
  * Copyright (C) 2008, 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
 
     ScriptValue() { }
 
     ScriptValue(ScriptState* scriptState, v8::Handle<v8::Value> value)
         : m_scriptState(scriptState)
         , m_value(value.IsEmpty() ? nullptr : SharedPersistent<v8::Value>::create(value, scriptState->isolate()))
     {
         ASSERT(isEmpty() || m_scriptState);
     }
 
+    template <typename T>
+    ScriptValue(ScriptState* scriptState, v8::MaybeLocal<T> value)
+        : m_scriptState(scriptState)
+        , m_value(value.IsEmpty() ? nullptr : SharedPersistent<v8::Value>::create(value.ToLocalChecked(), scriptState->isolate()))
+    {
+        ASSERT(isEmpty() || m_scriptState);
+    }
+
     ScriptValue(const ScriptValue& value)
         : m_scriptState(value.m_scriptState)
         , m_value(value.m_value)
     {
         ASSERT(isEmpty() || m_scriptState);
     }
 
     ScriptState* scriptState() const
     {
         return m_scriptState.get();
     }
 
     v8::Isolate* isolate() const
     {
         return m_scriptState ? m_scriptState->isolate() : v8::Isolate::GetCurrent();
     }
 
+    v8::Local<v8::Context> context() const
+    {
+        ASSERT(m_scriptState.get());
+        return m_scriptState->context();
+    }
+
     ScriptValue& operator=(const ScriptValue& value)
     {
         if (this != &value) {
             m_scriptState = value.m_scriptState;
             m_value = value.m_value;
         }
         return *this;
     }
 
     bool operator==(const ScriptValue& value) const
@@ skipping 61 matching lines @@
     static ScriptValue createNull(ScriptState*);
 
 private:
     RefPtr<ScriptState> m_scriptState;
     RefPtr<SharedPersistent<v8::Value>> m_value;
 };
 
 } // namespace blink
 
 #endif // ScriptValue_h