Move ScriptState::forWorld/ScriptState::forMainWorld (Part 1)

third_party/WebKit/Source/bindings/core/v8/V8Binding.h

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
index 81b839e5862974baf9cb0b5b6aac647a29e9b3a4..a06d2060706529fd82d3ad89cd8bc691c9ec6799 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
@@ -1004,6 +1004,13 @@ CORE_EXPORT v8::Local<v8::Context> toV8Context(LocalFrame*, DOMWrapperWorld&);
 CORE_EXPORT v8::Local<v8::Context> toV8ContextEvenIfDetached(LocalFrame*,
                                                              DOMWrapperWorld&);
 
+// These methods can return nullptr if the context associated with the
+// ScriptState has already been detached.
+CORE_EXPORT ScriptState* toScriptState(LocalFrame*, DOMWrapperWorld&);
+// Do not use this method unless you are sure you should use the main world's
+// ScriptState
+CORE_EXPORT ScriptState* toScriptStateForMainWorld(LocalFrame*);
+
 // Returns the frame object of the window object associated with
 // a context, if the window is currently being displayed in a Frame.
 CORE_EXPORT LocalFrame* toLocalFrameIfNotDetached(v8::Local<v8::Context>);