Expand WTF::StringView's API to be more like StringPiece.

third_party/WebKit/Source/wtf/Forward.h

 /*
  *  Copyright (C) 2006, 2009, 2011 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 37 matching lines @@
 class AtomicString;
 class CString;
 class Float32Array;
 class Float64Array;
 class Int8Array;
 class Int16Array;
 class Int32Array;
 class String;
 class StringBuilder;
 class StringImpl;
+class StringView;
 class Uint8Array;
 class Uint8ClampedArray;
 class Uint16Array;
 class Uint32Array;
 
 } // namespace WTF
 
 using WTF::OwnPtr;
 using WTF::PassOwnPtr;
 using WTF::PassRefPtr;
 using WTF::RefPtr;
 using WTF::Vector;
 using WTF::WeakPtr;
 
 using WTF::ArrayBuffer;
 using WTF::ArrayBufferView;
 using WTF::ArrayPiece;
 using WTF::AtomicString;
 using WTF::CString;
 using WTF::Float32Array;
 using WTF::Float64Array;
 using WTF::Int8Array;
 using WTF::Int16Array;
 using WTF::Int32Array;
 using WTF::String;
 using WTF::StringBuffer;
 using WTF::StringBuilder;
 using WTF::StringImpl;
+using WTF::StringView;
 using WTF::Uint8Array;
 using WTF::Uint8ClampedArray;
 using WTF::Uint16Array;
 using WTF::Uint32Array;
 
 #endif // WTF_Forward_h