Moving 4 SkImageFilter derived classes from blink to skia

include/effects/SkTileImageFilter.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTileImageFilter_DEFINED
+#define SkTileImageFilter_DEFINED
+
+#include "SkImageFilter.h"
+
+class SkTileImageFilter : public SkImageFilter {
+    typedef SkImageFilter INHERITED;
+
+public:
+    /** Tile image filter constructor
+        @param srcRect  Defines the pixels to tile
+        @param dstRect  Defines the pixels where tiles are drawn
+        @param input    Input from which the subregion defined by srcRect will be tiled
+    */
+    SkTileImageFilter(const SkRect& srcRect, const SkRect& dstRect, SkImageFilter* input)
+        : INHERITED(input), fSrcRect(srcRect), fDstRect(dstRect) {}
+
+    virtual bool onFilterImage(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
+                               SkBitmap* dst, SkIPoint* offset) SK_OVERRIDE;
+
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTileImageFilter)
+
+protected:
+    explicit SkTileImageFilter(SkFlattenableReadBuffer& buffer);
+
+    virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
+
+private:
+    SkRect fSrcRect;
+    SkRect fDstRect;
+};
+
+#endif