Improve handling of failed integer type conversions.

Source/bindings/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 109 matching lines @@
 private:
     void setException(v8::Handle<v8::Value>);
 
     String addExceptionContext(const String&) const;
 
     ScopedPersistent<v8::Value> m_exception;
     v8::Handle<v8::Object> m_creationContext;
     v8::Isolate* m_isolate;
 };
 
-class TrackExceptionState : public ExceptionState {
+// Used if exceptions can/should not be directly thrown.
+class NonThrowableExceptionState : public ExceptionState {
 public:
-    TrackExceptionState(): ExceptionState(v8::Handle<v8::Object>(), 0) { }
+    NonThrowableExceptionState(): ExceptionState(v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE FINAL;
     virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE FINAL;
+};
+
+// Used if any exceptions thrown are ignorable.
+class TrackExceptionState : public ExceptionState {
+public:
+    TrackExceptionState(): ExceptionState(v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
+    virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE FINAL;
+    virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
+    virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE FINAL;
 };
 
 } // namespace WebCore
 
 #endif // ExceptionState_h