[WIP] Supporting arm_neon_optional flag for blink platform.

Source/platform/audio/VectorMath.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
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 // For an element-by-element multiply of two float vectors.
 PLATFORM_EXPORT void vmul(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess);
 
 // Multiplies two complex vectors.
 PLATFORM_EXPORT void zvmul(const float* real1P, const float* imag1P, const float* real2P, const float* imag2P, float* realDestP, float* imagDestP, size_t framesToProcess);
 
 // Copies elements while clipping values to the threshold inputs.
 PLATFORM_EXPORT void vclip(const float* sourceP, int sourceStride, const float* lowThresholdP, const float* highThresholdP, float* destP, int destStride, size_t framesToProcess);
 
+#if HAVE(ARM_NEON_INTRINSICS)
+// Neon optimized math functions.
+void vsmaNEON(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess);
+void vsmulNEON(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess);
+void vaddNEON(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess);
+void vmaxmgvNEON(const float* sourceP, int sourceStride, float* maxP, size_t framesToProcess);
+void vsvesqNEON(const float* sourceP, int sourceStride, float* sumP, size_t framesToProcess);
+void vmulNEON(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess);
+void zvmulNEON(const float* real1P, const float* imag1P, const float* real2P, const float* imag2P, float* realDestP, float* imagDestP, size_t framesToProcess);
+void vclipNEON(const float* sourceP, int sourceStride, const float* lowThresholdP, const float* highThresholdP, float* destP, int destStride, size_t framesToProcess);
+#endif
+
 } // namespace VectorMath
 } // namespace blink
 
 #endif // VectorMath_h