Rewriting MatrixConvolution image filter with SSE and AVX2

src/opts/SkMatrixConvolutionImageFilter_opts_AVX2.h

Index: src/opts/SkMatrixConvolutionImageFilter_opts_AVX2.h
diff --git a/src/opts/SkMatrixConvolutionImageFilter_opts_AVX2.h b/src/opts/SkMatrixConvolutionImageFilter_opts_AVX2.h
new file mode 100644
index 0000000000000000000000000000000000000000..886abbceb81475acf72ece0a208241e8c3122489
--- /dev/null
+++ b/src/opts/SkMatrixConvolutionImageFilter_opts_AVX2.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMatrixConvolutionImageFilter_opts_AVX2_DEFINED
+#define SkMatrixConvolutionImageFilter_opts_AVX2_DEFINED
+
+#include "SkScalar.h"
+#include "SkSize.h"
+#include "SkPoint.h"
+
+
+namespace sk_avx2{
+
+void SkMatrixConvolutionImageFilter_filterPixels_AVX2(
+                                                      const SkBitmap& src,
+                                                      SkBitmap* result,
+                                                      const SkIRect& r,
+                                                      const SkIRect& bounds,
+                                                      bool convolveAlpha,
+                                                      SkScalar* kernel,
+                                                      const SkISize& kernel_size,
+                                                      const SkIPoint&  kernel_offset, SkScalar gain,
+                                                      SkScalar bias);
+
+}
+
+#endif