Alternate version of SkLocalMatrixImageFilter using an input.

src/core/SkLocalMatrixImageFilter.h

Index: src/core/SkLocalMatrixImageFilter.h
diff --git a/src/core/SkLocalMatrixImageFilter.h b/src/core/SkLocalMatrixImageFilter.h
new file mode 100644
index 0000000000000000000000000000000000000000..f908d025a5a8d6d483f3e834c5a299829f753917
--- /dev/null
+++ b/src/core/SkLocalMatrixImageFilter.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2015 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.
+ */
+
+#ifndef SkLocalMatrixImageFilter_DEFINED
+#define SkLocalMatrixImageFilter_DEFINED
+
+#include "SkImageFilter.h"
+#include "SkReadBuffer.h"
+#include "SkString.h"
+
+/**
+ *  Wraps another imagefilter + matrix, such that using this filter will give the same result
+ *  as using the wrapped filter with the matrix applied to its context.
+ */
+class SkLocalMatrixImageFilter : public SkImageFilter {
+public:
+    static SkImageFilter* Create(const SkMatrix& localM, SkImageFilter* input);
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixImageFilter)
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+    bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
+                       SkBitmap* result, SkIPoint* offset) const override;
+    bool onFilterBounds(const SkIRect& src, const SkMatrix&, SkIRect* dst) const override;
+
+private:
+    SkLocalMatrixImageFilter(const SkMatrix& localM, SkImageFilter* input);
+
+    SkMatrix                    fLocalM;
+
+    typedef SkImageFilter INHERITED;
+};
+
+#endif