Adding more validation

src/effects/SkRectShaderImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRectShaderImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 17 matching lines @@
 }
 
 SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect)
   : INHERITED(NULL, cropRect)
   , fShader(s) {
     SkASSERT(s);
     s->ref();
 }
 
 SkRectShaderImageFilter::SkRectShaderImageFilter(SkFlattenableReadBuffer& buffer)
-  : INHERITED(buffer) {
+  : INHERITED(1, buffer) {
     fShader = buffer.readShader();
 }
 
 void SkRectShaderImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
 
     buffer.writeFlattenable(fShader);
 }
 
 SkRectShaderImageFilter::~SkRectShaderImageFilter() {
@@ skipping 19 matching lines @@
     SkMatrix matrix;
     matrix.setTranslate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
     fShader->setLocalMatrix(matrix);
     SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
     canvas.drawRect(rect, paint);
     *result = device.get()->accessBitmap(false);
     offset->fX += bounds.fLeft;
     offset->fY += bounds.fTop;
     return true;
 }