Adding more validation

gm/imagefiltersgraph.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkArithmeticMode.h"
@@ skipping 40 matching lines @@
         *dst = device->accessBitmap(false);
         offset->fX += bounds.left();
         offset->fY += bounds.top();
         return true;
     }
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SimpleOffsetFilter);
 
 protected:
     explicit SimpleOffsetFilter(SkFlattenableReadBuffer& buffer)
-    : SkImageFilter(buffer) {
+    : SkImageFilter(1, buffer) {
         fDX = buffer.readScalar();
         fDY = buffer.readScalar();
     }
 
     virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE {
         this->SkImageFilter::flatten(buffer);
         buffer.writeScalar(fDX);
         buffer.writeScalar(fDY);
     }
 
@@ skipping 115 matching lines @@
 private:
     typedef GM INHERITED;
     SkBitmap fBitmap;
     bool fInitialized;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersGraphGM; }
 static skiagm::GMRegistry reg(MyFactory);