[WIP] Supporting arm_neon_optional flag for blink platform.

Source/platform/graphics/filters/FEBlend.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 17 matching lines @@
 
 namespace blink {
 
 class PLATFORM_EXPORT FEBlend : public FilterEffect {
 public:
     static PassRefPtr<FEBlend> create(Filter*, WebBlendMode);
 
     WebBlendMode blendMode() const;
     bool setBlendMode(WebBlendMode);
 
-    void platformApplyGeneric(unsigned char* srcPixelArrayA, unsigned char* srcPixelArrayB, unsigned char* dstPixelArray,
-                           unsigned colorArrayLength);
-    void platformApplyNEON(unsigned char* srcPixelArrayA, unsigned char* srcPixelArrayB, unsigned char* dstPixelArray,
-                           unsigned colorArrayLength);
     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
 
     virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
 
 private:
     FEBlend(Filter*, WebBlendMode);
 
     virtual void applySoftware() OVERRIDE;
-    bool applySoftwareNEON();
+    void applySoftwareInternal();
+
+#if HAVE(ARM_NEON_INTRINSICS)
+    void applySoftwareInternalNEON();
+    void platformApplyNEON(unsigned char* srcPixelArrayA, unsigned char* srcPixelArrayB, unsigned char* dstPixelArray, unsigned colorArrayLength);
+#endif
 
     WebBlendMode m_mode;
 };
 
 } // namespace blink
 
 #endif // FEBlend_h