Update the stringifier behavior for DOMMatrixReadOnly

third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMMatrixReadOnly_h
 #define DOMMatrixReadOnly_h
 
 #include <memory>
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/StringOrUnrestrictedDoubleSequence.h"
@@ skipping 79 matching lines @@
   DOMMatrix* skewY(double sy);
   DOMMatrix* flipX();
   DOMMatrix* flipY();
   DOMMatrix* inverse();
 
   DOMPoint* transformPoint(const DOMPointInit&);
 
   NotShared<DOMFloat32Array> toFloat32Array() const;
   NotShared<DOMFloat64Array> toFloat64Array() const;
 
-  const String toString() const;
+  const String toString(ExceptionState&) const;
 
   ScriptValue toJSONForBinding(ScriptState*) const;
 
   const TransformationMatrix& Matrix() const { return *matrix_; }
 
   DEFINE_INLINE_TRACE() {}
 
  protected:
   DOMMatrixReadOnly() {}
   DOMMatrixReadOnly(const String&, ExceptionState&);
@@ skipping 25 matching lines @@
   // supports 16-byte alignment but Oilpan doesn't. So we use an std::unique_ptr
   // to allocate TransformationMatrix on PartitionAlloc.
   // TODO(oilpan): Oilpan should support 16-byte aligned allocations.
   std::unique_ptr<TransformationMatrix> matrix_;
   bool is2d_;
 };
 
 }  // namespace blink
 
 #endif