Clean up SkImageFilter constructors.

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 53 matching lines @@
     }
 
     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         this->SkImageFilter::flatten(buffer);
         buffer.writeScalar(fDX);
         buffer.writeScalar(fDY);
     }
 
 private:
     SimpleOffsetFilter(SkScalar dx, SkScalar dy, SkImageFilter* input)
-    : SkImageFilter(input), fDX(dx), fDY(dy) {}
+    : SkImageFilter(1, &input), fDX(dx), fDY(dy) {}
 
     SkScalar fDX, fDY;
 };
 
 SkFlattenable::Registrar registrar("SimpleOffsetFilter",
                                    SimpleOffsetFilter::CreateProc,
                                    SimpleOffsetFilter::GetFlattenableType());
 
 class ImageFiltersGraphGM : public skiagm::GM {
 public:
@@ skipping 124 matching lines @@
 
 private:
     typedef GM INHERITED;
     SkBitmap fBitmap;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersGraphGM; }
 static skiagm::GMRegistry reg(MyFactory);