Update libwebp to 0.4.0

third_party/libwebp/utils/quant_levels_dec.c

 // Copyright 2013 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.
 // -----------------------------------------------------------------------------
 //
 // TODO(skal): implement gradient smoothing.
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include "./quant_levels_dec.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
-int DequantizeLevels(uint8_t* const data, int width, int height) {
-  if (data == NULL || width <= 0 || height <= 0) return 0;
-  (void)data;
-  (void)width;
-  (void)height;
+int DequantizeLevels(uint8_t* const data, int width, int height,
+                     int row, int num_rows) {
+  if (data == NULL || width <= 0 || height <= 0 || row < 0 || num_rows < 0 ||
+      row + num_rows > height) {
+    return 0;
+  }
   return 1;
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif