Initial implementation of a SkColorSpace_A2B xform

src/core/SkColorSpaceXform_A2B.h

Index: src/core/SkColorSpaceXform_A2B.h
diff --git a/src/core/SkColorSpaceXform_A2B.h b/src/core/SkColorSpaceXform_A2B.h
new file mode 100644
index 0000000000000000000000000000000000000000..34a01e8015f4092e943f56bf0154b71664041fc6
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+++ b/src/core/SkColorSpaceXform_A2B.h
@@ -0,0 +1,42 @@
+/*
+ * 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 SkColorSpaceXform_A2B_DEFINED
+#define SkColorSpaceXform_A2B_DEFINED
+
+#include "SkColorSpace_Base.h"
+#include "SkColorSpaceXform_Base.h"
+#include "SkRasterPipeline.h"
+
+#include <forward_list>
+#include <vector>
+
+class SkColorSpace_A2B;
+class SkColorSpace_XYZ;
+
+
+class SkColorSpaceXform_A2B : public SkColorSpaceXform_Base {
+public:
+    bool onApply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
+                 int count, SkAlphaType alphaType) const override;
+
+private:
+    SkColorSpaceXform_A2B(SkColorSpace_A2B* srcSpace, SkColorSpace_XYZ* dstSpace);
+
+
+    SkRasterPipeline                                   fElementsPipeline;
+    bool                                               fLinearDstGamma;
+    // storage used by the pipeline
+    std::forward_list<SkColorSpaceTransferFn>          fParametricGammas;
+    std::forward_list<std::vector<float>>              fTableGammas;
+    std::forward_list<SkMatrix44>                      fMatrices;
+    std::forward_list<sk_sp<const SkColorLookUpTable>> fCLUTs;
+
+    friend class SkColorSpaceXform;
+};
+
+#endif