Reland SkGifCodec

SkGifCodec work was reverted as a suspected cause of a paint regression.
But it may end up being unrelated.

This is a revert of crrev.com/c/718918

Bug: 768878,778164,773548
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ifb72574cf2012d417c223193cbd14b52ec644b9a
Reviewed-on: https://chromium-review.googlesource.com/783647
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592590}

skia/BUILD.gn

@@ -57,6 +57,7 @@ config("skia_config") {
   ]
 
   if (!is_ios) {
+    include_dirs += [ "//third_party/skia/include/codec" ]
     defines += [ "SK_HAS_JPEG_LIBRARY" ]
   }
   if (enable_vulkan) {

third_party/blink/renderer/platform/BUILD.gn

@@ -1120,8 +1120,6 @@ jumbo_component("platform") {
     "image-decoders/fast_shared_buffer_reader.h",
     "image-decoders/gif/gif_image_decoder.cc",
     "image-decoders/gif/gif_image_decoder.h",
-    "image-decoders/gif/gif_image_reader.cc",
-    "image-decoders/gif/gif_image_reader.h",
     "image-decoders/ico/ico_image_decoder.cc",
     "image-decoders/ico/ico_image_decoder.h",
     "image-decoders/image_animation.h",
@@ -1137,6 +1135,8 @@ jumbo_component("platform") {
     "image-decoders/png/png_image_reader.h",
     "image-decoders/segment_reader.cc",
     "image-decoders/segment_reader.h",
+    "image-decoders/segment_stream.cc",
+    "image-decoders/segment_stream.h",
     "image-decoders/webp/webp_image_decoder.cc",
     "image-decoders/webp/webp_image_decoder.h",
     "image-encoders/image_encoder.cc",
@@ -1760,6 +1760,7 @@ jumbo_source_set("blink_platform_unittests_sources") {
     "image-decoders/image_frame_test.cc",
     "image-decoders/jpeg/jpeg_image_decoder_test.cc",
     "image-decoders/png/png_image_decoder_test.cc",
+    "image-decoders/segment_stream_test.cc",
     "image-decoders/webp/webp_image_decoder_test.cc",
     "json/json_parser_test.cc",
     "json/json_values_test.cc",