Revert of Move SkPixelXorXfermode.h to include/client/android

include/effects/SkPixelXorXfermode.h

Index: include/effects/SkPixelXorXfermode.h
diff --git a/include/effects/SkPixelXorXfermode.h b/include/effects/SkPixelXorXfermode.h
new file mode 100644
index 0000000000000000000000000000000000000000..4aa78ccf5e417e04fad97e554dbbcf0cc94988b1
--- /dev/null
+++ b/include/effects/SkPixelXorXfermode.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2007 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 SkPixelXorXfermode_DEFINED
+#define SkPixelXorXfermode_DEFINED
+
+#include "SkXfermode.h"
+
+/** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst).
+    This transformation does not follow premultiplied conventions, therefore
+    this proc *always* returns an opaque color (alpha == 255). Thus it is
+    not really usefull for operating on blended colors.
+*/
+class SK_API SkPixelXorXfermode : public SkXfermode {
+public:
+    static SkXfermode* Create(SkColor opColor) {
+        return new SkPixelXorXfermode(opColor);
+    }
+
+#if SK_SUPPORT_GPU
+    bool asFragmentProcessor(const GrFragmentProcessor** output,
+                             const GrFragmentProcessor* dst) const override;
+
+    bool asXPFactory(GrXPFactory**) const override;
+#endif
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+    SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override;
+
+private:
+    explicit SkPixelXorXfermode(SkColor opColor) {
+        fOpColor = SkPreMultiplyColor(opColor | 0xFF000000);
+    }
+
+    SkPMColor fOpColor;
+
+    typedef SkXfermode INHERITED;
+};
+
+#endif