Fix -Wunused-parameter errors in SkCodec.h in Android

gyp/tools.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
     # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
@@ skipping 571 matching lines @@
     {
       'target_name': 'test_public_includes',
       'type': 'static_library',
       # Ensure that our public headers don't have unused params so that clients
       # (e.g. Android) that include us can build with these warnings enabled
       'cflags!': [ '-Wno-unused-parameter' ],
       'variables': {
         'includes_to_test': [
           '<(skia_include_path)/animator',
           '<(skia_include_path)/c',
+          '<(skia_include_path)/codec',
           '<(skia_include_path)/config',
           '<(skia_include_path)/core',
           '<(skia_include_path)/effects',
           '<(skia_include_path)/gpu',
           '<(skia_include_path)/images',
           '<(skia_include_path)/pathops',
           '<(skia_include_path)/pipe',
           '<(skia_include_path)/ports',
           '<(skia_include_path)/svg/parser',
           '<(skia_include_path)/utils',
@@ skipping 135 matching lines @@
               'flags.gyp:flags',
               'skia_lib.gyp:skia_lib',
               'resources',
             ],
           },
         ],
       },
     ],
   ],
 }