Add support for multiple frames in SkCodec

gyp/codec.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.
 # 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 for codec project.
 {
   'targets': [
     {
       'target_name': 'codec',
       'product_name': 'skia_codec',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
-        'giflib.gyp:giflib',
         'libjpeg-turbo-selector.gyp:libjpeg-turbo-selector',
         'libpng.gyp:libpng',
         'libwebp.gyp:libwebp',
       ],
       'include_dirs': [
         '../include/codec',
         '../include/private',
         '../src/codec',
         '../src/core',
         '../src/utils',
       ],
       'sources': [
         '../src/codec/SkAndroidCodec.cpp',
         '../src/codec/SkBmpCodec.cpp',
         '../src/codec/SkBmpMaskCodec.cpp',
         '../src/codec/SkBmpRLECodec.cpp',
         '../src/codec/SkBmpStandardCodec.cpp',
         '../src/codec/SkCodec.cpp',
         '../src/codec/SkGifCodec.cpp',
+        '../src/codec/GIFImageReader.cpp',
         '../src/codec/SkIcoCodec.cpp',
         '../src/codec/SkJpegCodec.cpp',
         '../src/codec/SkJpegDecoderMgr.cpp',
         '../src/codec/SkJpegUtility.cpp',
         '../src/codec/SkMaskSwizzler.cpp',
         '../src/codec/SkMasks.cpp',
         '../src/codec/SkPngCodec.cpp',
         '../src/codec/SkSampler.cpp',
         '../src/codec/SkSampledCodec.cpp',
+        '../src/codec/SkStreamBuffer.cpp',
         '../src/codec/SkSwizzler.cpp',
         '../src/codec/SkWbmpCodec.cpp',
         '../src/codec/SkWebpAdapterCodec.cpp',
         '../src/codec/SkWebpCodec.cpp',
 
         '../src/codec/SkCodecImageGenerator.cpp',
         '../src/ports/SkImageGenerator_skia.cpp',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
@@ skipping 53 matching lines @@
         ['skia_os == "ios" or skia_os == "mac"', {
           'xcode_settings': {
             'OTHER_CFLAGS': ['-fexceptions'],
             'OTHER_CPLUSPLUSFLAGS': ['-fexceptions'],
           },
         }],
       ],
     },
   ],
 }