Add support for NEON intrinsics to speed up texture compression. We can

src/utils/SkTextureCompressor.h

Index: src/utils/SkTextureCompressor.h
diff --git a/src/utils/SkTextureCompressor.h b/src/utils/SkTextureCompressor.h
index 35b9b864307405122f1e1d6e9c313b5376f4237a..ec6153ace9d945c38544633335dde8f9f3f85ce0 100644
--- a/src/utils/SkTextureCompressor.h
+++ b/src/utils/SkTextureCompressor.h
@@ -34,7 +34,14 @@ namespace SkTextureCompressor {
     // large enough to hold width*height pixels. The dst data is expected to
     // be large enough to hold the compressed data according to the format.
     bool CompressBufferToFormat(uint8_t* dst, const uint8_t* src, SkColorType srcColorType,
-                                int width, int height, int rowBytes, Format format);
+                                int width, int height, int rowBytes, Format format,
+                                bool opt = true /* Use optimization if available */);
+
+    // This typedef defines what the nominal aspects of a compression function
+    // are. The typedef is not meant to be used by clients of the API, but rather
+    // allows SIMD optimized compression functions to be implemented.
+    typedef bool (*CompressionProc)(uint8_t* dst, const uint8_t* src,
+                                    int width, int height, int rowBytes);
 }
 
 #endif