WIP: Added support for giflib, updated jpeg and png

gyp/common_variables.gypi

 # Copyright 2012 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.
 
 {
   # Get ready for the ugly...
   #
   # - We have to nest our variables dictionaries multiple levels deep, so that
   #   this and other gyp files can rely on previously-set variable values in
@@ skipping 100 matching lines @@
           #     that; instead statically link to the version in
           #     third_party/freetype and third_party/externals/freetype.
           {
             'skia_freetype_static%': '1',
           }, {
             'skia_freetype_static%': '0',
           }
         ],
       ],
 
-      # skia_giflib_static - on OS variants that normally would link giflib
-      #     with '-lgif' and include the headers from '/usr/include/gif_lib.h',
-      #     don't do that; instead compile and staticlly link the version of
-      #     giflib in third_party/externals/giflib.
-      'skia_giflib_static%': '0',
-
-
       # skia_no_fontconfig - On POSIX systems that would normally use the
       #     SkFontHost_fontconfig interface; use the SkFontHost_linux
       #     version instead.
       'skia_no_fontconfig%': '0',
 
       'skia_sanitizer%': '',
       'skia_scalar%': 'float',
       'skia_mesa%': 0,
       'skia_gpu_extra_dependency_path%': '',
       'skia_stroke_path_rendering%': 0,
@@ skipping 61 matching lines @@
     # so that siblings of the level-1 'variables' dict can see them.
     'arm_version%': '<(arm_version)',
     'arm_neon%': '<(arm_neon)',
     'arm_neon_optional%': 0,
     'mips_arch_variant%': 'mips32',
     'mips_dsp%': 0,
     'skia_os%': '<(skia_os)',
     'os_posix%': '<(os_posix)',
 
     'skia_freetype_static%': '<(skia_freetype_static)',
-    'skia_giflib_static%': '<(skia_giflib_static)',
     'skia_no_fontconfig%': '<(skia_no_fontconfig)',
     'skia_sanitizer%': '<(skia_sanitizer)',
     'skia_scalar%': '<(skia_scalar)',
     'skia_mesa%': '<(skia_mesa)',
     'skia_gpu_extra_dependency_path%': '<(skia_gpu_extra_dependency_path)',
     'skia_stroke_path_rendering%': '<(skia_stroke_path_rendering)',
     'skia_android_framework%': '<(skia_android_framework)',
     'skia_use_system_json%': '<(skia_use_system_json)',
     'skia_android_path_rendering%': '<(skia_android_path_rendering)',
     'skia_resource_cache_mb_limit%': '<(skia_resource_cache_mb_limit)',
@@ skipping 27 matching lines @@
         '-ffast-math',           # Optimize float math even when it breaks IEEE compliance.
         #'-flto'                  # Enable link-time optimization.
     ],
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }