libwebp: update snapshot to v0.3.0-rc6

third_party/libwebp/enc/histogram.h

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // This code is licensed under the same terms as WebM:
 //  Software License Agreement:  http://www.webmproject.org/license/software/
 //  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
 // -----------------------------------------------------------------------------
 //
 // Author: Jyrki Alakuijala (jyrki@google.com)
 //
 // Models the histograms of literal and distance codes.
@@ skipping 62 matching lines @@
                                      const PixOrCopy* const v);
 
 // Estimate how many bits the combined entropy of literals and distance
 // approximately maps to.
 double VP8LHistogramEstimateBits(const VP8LHistogram* const p);
 
 // This function estimates the cost in bits excluding the bits needed to
 // represent the entropy code itself.
 double VP8LHistogramEstimateBitsBulk(const VP8LHistogram* const p);
 
-static WEBP_INLINE void VP8LHistogramAdd(VP8LHistogram* const p,
-                                         const VP8LHistogram* const a) {
-  int i;
-  for (i = 0; i < PIX_OR_COPY_CODES_MAX; ++i) {
-    p->literal_[i] += a->literal_[i];
-  }
-  for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
-    p->distance_[i] += a->distance_[i];
-  }
-  for (i = 0; i < 256; ++i) {
-    p->red_[i] += a->red_[i];
-    p->blue_[i] += a->blue_[i];
-    p->alpha_[i] += a->alpha_[i];
-  }
-}
-
 static WEBP_INLINE int VP8LHistogramNumCodes(const VP8LHistogram* const p) {
   return 256 + NUM_LENGTH_CODES +
       ((p->palette_code_bits_ > 0) ? (1 << p->palette_code_bits_) : 0);
 }
 
 // Builds the histogram image.
 int VP8LGetHistoImageSymbols(int xsize, int ysize,
                              const VP8LBackwardRefs* const refs,
                              int quality, int histogram_bits, int cache_bits,
                              VP8LHistogramSet* const image_in,
                              uint16_t* const histogram_symbols);
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif
 
 #endif  // WEBP_ENC_HISTOGRAM_H_