[WIP] Supporting arm_neon_optional flag for blink platform.

Source/platform/graphics/filters/FEBlend.h

Index: Source/platform/graphics/filters/FEBlend.h
diff --git a/Source/platform/graphics/filters/FEBlend.h b/Source/platform/graphics/filters/FEBlend.h
index 3dd1fcd5c9bcb29669521ab799fb730c757ee8c5..7055e1b7444034bb18f1384e72932f94b0f1cdb5 100644
--- a/Source/platform/graphics/filters/FEBlend.h
+++ b/Source/platform/graphics/filters/FEBlend.h
@@ -35,10 +35,6 @@ public:
     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;
@@ -47,7 +43,12 @@ 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;
 };