Start to vectorize SkTileGrid.

include/core/SkTypes.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTypes_DEFINED
 #define SkTypes_DEFINED
 
@@ skipping 282 matching lines @@
 
 #define SkAlign2(x)     (((x) + 1) >> 1 << 1)
 #define SkIsAlign2(x)   (0 == ((x) & 1))
 
 #define SkAlign4(x)     (((x) + 3) >> 2 << 2)
 #define SkIsAlign4(x)   (0 == ((x) & 3))
 
 #define SkAlign8(x)     (((x) + 7) >> 3 << 3)
 #define SkIsAlign8(x)   (0 == ((x) & 7))
 
+#define SkAlign16(x)    (((x) + 15) >> 4 << 4)
+#define SkIsAlign16(x)  (0 == ((x) & 15))
+
 #define SkAlignPtr(x)   (sizeof(void*) == 8 ?   SkAlign8(x) :   SkAlign4(x))
 #define SkIsAlignPtr(x) (sizeof(void*) == 8 ? SkIsAlign8(x) : SkIsAlign4(x))
 
 typedef uint32_t SkFourByteTag;
 #define SkSetFourByteTag(a, b, c, d)    (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
 
 /** 32 bit integer to hold a unicode value
 */
 typedef int32_t SkUnichar;
 /** 32 bit value to hold a millisecond count
@@ skipping 355 matching lines @@
 private:
     void*       fPtr;
     size_t      fSize;  // can be larger than the requested size (see kReuse)
     uint32_t    fStorage[(kSize + 3) >> 2];
 };
 // Can't guard the constructor because it's a template class.
 
 #endif /* C++ */
 
 #endif