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

src/utils/SkTextureCompressor.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTextureCompressor_DEFINED
 #define SkTextureCompressor_DEFINED
 
@@ skipping 16 matching lines @@
     // Returns an SkData holding a blob of compressed data that corresponds
     // to the bitmap. If the bitmap colorType cannot be compressed using the 
     // associated format, then we return NULL. The caller is responsible for
     // calling unref() on the returned data.
     SkData* CompressBitmapToFormat(const SkBitmap& bitmap, Format format);
 
     // Compresses the given src data into dst. The src data is assumed to be
     // 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