Adding more validation

src/effects/SkBitmapSource.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapSource.h"
 
 SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
-  : INHERITED(0),
+  : INHERITED(0, 0),
     fBitmap(bitmap) {
 }
 
 SkBitmapSource::SkBitmapSource(SkFlattenableReadBuffer& buffer)
-  : INHERITED(buffer) {
+  : INHERITED(0, buffer) {
     fBitmap.unflatten(buffer);
 }
 
 void SkBitmapSource::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     fBitmap.flatten(buffer);
 }
 
 bool SkBitmapSource::onFilterImage(Proxy*, const SkBitmap&, const SkMatrix&,
                                    SkBitmap* result, SkIPoint* offset) {
     *result = fBitmap;
     return true;
 }