Update libwebp to 0.4.0

third_party/libwebp/dsp/enc_neon.c

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // ARM NEON version of speed-critical encoding functions.
 //
 // adapted from libvpx (http://www.webmproject.org/code/)
 
 #include "./dsp.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #if defined(WEBP_USE_NEON)
 
 #include "../enc/vp8enci.h"
 
 //------------------------------------------------------------------------------
 // Transforms (Paragraph 14.4)
 
 // Inverse transform.
 // This code is pretty much the same as TransformOneNEON in the decoder, except
 // for subtraction to *ref. See the comments there for algorithmic explanations.
@@ skipping 456 matching lines @@
     "vtrn.32         q8, q9                   \n"
     "vtrn.32         q15, q14                 \n"
 
     // The first Q register is a, the second b.
     // q0/8 tmp[0-3]
     // q13/15 tmp[4-7]
     // q1/9 tmp[8-11]
     // q12/14 tmp[12-15]
 
     // These are still in 01 45 23 67 order. We fix it easily in the addition
-    // case but the subtraction propegates them.
+    // case but the subtraction propagates them.
     "vswp            d3, d27                  \n"
     "vswp            d19, d31                 \n"
 
     // a0 = tmp[0] + tmp[8]
     "vadd.s32        q2, q0, q1               \n"
     "vadd.s32        q3, q8, q9               \n"
 
     // a1 = tmp[4] + tmp[12]
     "vadd.s32        q10, q13, q12            \n"
     "vadd.s32        q11, q15, q14            \n"
@@ skipping 120 matching lines @@
   VP8FTransform = FTransform;
 
   VP8ITransformWHT = ITransformWHT;
   VP8FTransformWHT = FTransformWHT;
 
   VP8TDisto4x4 = Disto4x4;
   VP8TDisto16x16 = Disto16x16;
 #endif   // WEBP_USE_NEON
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif