Disallow certain blocking DOM calls during microtask execution.

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

 /*
  * Copyright (C) 2013 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 97 matching lines @@
 
     ContextType context() const { return m_context; }
     const char* propertyName() const { return m_propertyName; }
     const char* interfaceName() const { return m_interfaceName; }
 
     void rethrowV8Exception(v8::Local<v8::Value> value)
     {
         setException(value);
     }
 
+    // Might return nullptr.
+    v8::Isolate* isolate() const { return m_isolate; }
+
 #if ENABLE(ASSERT)
     OnStackObjectChecker& getOnStackObjectChecker() { return m_onStackObjectChecker; }
 #endif
 
 protected:
     ExceptionCode m_code;
     ContextType m_context;
     String m_message;
     const char* m_propertyName;
     const char* m_interfaceName;
@@ skipping 30 matching lines @@
     TrackExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Local<v8::Object>(), v8::Isolate::GetCurrent()) { }
     void throwDOMException(const ExceptionCode&, const String& message) override;
     void throwTypeError(const String& message = String()) override;
     void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) override;
     void throwRangeError(const String& message) override;
 };
 
 } // namespace blink
 
 #endif // ExceptionState_h