Add support for multiple frames in SkCodec

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("gn/shared_sources.gni")
 
 if (!defined(is_skia_standalone)) {
   is_skia_standalone = false
 }
 
 declare_args() {
   skia_use_angle = false
   skia_use_expat = true
   skia_use_fontconfig = is_linux
   skia_use_freetype = is_android || is_fuchsia || is_linux
   skia_use_gdi = false
-  skia_use_giflib = !is_fuchsia
   skia_use_libjpeg_turbo = true
   skia_use_libpng = true
   skia_use_libwebp = !is_fuchsia
   skia_use_mesa = false
   skia_use_sfntly = !is_fuchsia && !is_win  # TODO: icu on Windows, re-enable this.
   skia_use_vulkan = is_android && defined(ndk_api) && ndk_api >= 24
   skia_use_zlib = true
 
   skia_enable_android_framework_defines = false
   skia_enable_gpu = true
@@ skipping 64 matching lines @@
     "src/lazy",
     "src/opts",
     "src/pathops",
     "src/pdf",
     "src/ports",
     "src/sfnt",
     "src/sksl",
     "src/utils",
     "src/utils/win",
     "third_party/etc1",
+    "third_party/gif",
     "third_party/ktx",
   ]
 
   defines = [ "SK_GAMMA_APPLY_TO_A8" ]
   if (is_android) {
     defines += [
       "SK_GAMMA_EXPONENT=1.4",
       "SK_GAMMA_CONTRAST=0.0",
     ]
   }
@@ skipping 236 matching lines @@
 
   deps = [
     "//third_party/freetype2",
   ]
   sources = [
     "src/ports/SkFontMgr_custom.cpp",
     "src/ports/SkFontMgr_custom_empty_factory.cpp",
   ]
 }
 
-optional("gif") {
-  enabled = skia_use_giflib
-  public_defines = [ "SK_HAS_GIF_LIBRARY" ]
-
-  deps = [
-    "//third_party/giflib",
-  ]
-  sources = [
-    "src/codec/SkGifCodec.cpp",
-  ]
-}
-
 optional("gpu") {
   enabled = skia_enable_gpu
   public_defines = []
 
   sources = skia_gpu_sources + [ "src/gpu/gl/GrGLDefaultInterface_native.cpp" ]
 
   # These paths need to be absolute to match the ones produced by shared_sources.gni.
   sources -= get_path_info([
                              "src/gpu/gl/GrGLCreateNativeInterface_none.cpp",
                              "src/gpu/gl/GrGLDefaultInterface_none.cpp",
@@ skipping 113 matching lines @@
   deps = [
     ":arm64",
     ":armv7",
     ":avx",
     ":crc32",
     ":dsp",
     ":fontmgr_android",
     ":fontmgr_custom",
     ":fontmgr_fontconfig",
     ":fontmgr_fuchsia",
-    ":gif",
     ":gpu",
     ":hsw",
     ":jpeg",
     ":none",
     ":pdf",
     ":png",
     ":sse2",
     ":sse41",
     ":sse42",
     ":ssse3",
@@ skipping 10 matching lines @@
   sources += [
     "src/android/SkBitmapRegionCodec.cpp",
     "src/android/SkBitmapRegionDecoder.cpp",
     "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/SkCodecImageGenerator.cpp",
+    "src/codec/SkGifCodec.cpp",
     "src/codec/SkMaskSwizzler.cpp",
     "src/codec/SkMasks.cpp",
     "src/codec/SkSampledCodec.cpp",
     "src/codec/SkSampler.cpp",
+    "src/codec/SkStreamBuffer.cpp",
     "src/codec/SkSwizzler.cpp",
     "src/codec/SkWbmpCodec.cpp",
     "src/images/SkImageEncoder.cpp",
     "src/images/SkImageEncoder_Factory.cpp",
     "src/images/SkKTXImageEncoder.cpp",
     "src/ports/SkDiscardableMemory_none.cpp",
     "src/ports/SkGlobalInitialization_default.cpp",
     "src/ports/SkImageGenerator_skia.cpp",
     "src/ports/SkMemory_malloc.cpp",
     "src/ports/SkOSFile_stdio.cpp",
     "src/sfnt/SkOTTable_name.cpp",
     "src/sfnt/SkOTUtils.cpp",
     "src/svg/SkSVGCanvas.cpp",
     "src/svg/SkSVGDevice.cpp",
     "src/utils/mac/SkStream_mac.cpp",
     "third_party/etc1/etc1.cpp",
+    "third_party/gif/GIFImageReader.cpp",
     "third_party/ktx/ktx.cpp",
   ]
 
   libs = []
 
   if (is_win) {
     sources += [
       "src/fonts/SkFontMgr_indirect.cpp",
       "src/ports/SkDebug_win.cpp",
       "src/ports/SkFontHost_win.cpp",
@@ skipping 255 matching lines @@
                            [
                              "*.c*",
                              rebase_path("gm"),
                            ],
                            "list lines",
                            [])
   test_lib("gm") {
     public_include_dirs = [ "gm" ]
     sources = gm_sources
     deps = [
+      ":flags",
       ":gpu_tool_utils",
       ":skia",
       ":tool_utils",
     ]
   }
 
   tests_sources = exec_script("gyp/find.py",
                               [
                                 "*.c*",
                                 rebase_path("tests"),
@@ skipping 414 matching lines @@
       ]
       if (is_android) {
         deps += [ "//third_party/native_app_glue" ]
       } else if (is_mac) {
         deps += [ "//third_party/libsdl" ]
       }
       testonly = true
     }
   }
 }