Add support for multiple frames in SkCodec

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 3f88df5d279f4c6473054c6007bde952c14513f6..2ca8c323f55aaba299f91e1eeeb090f3a222e64b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -14,7 +14,7 @@ declare_args() {
   skia_use_expat = true
   skia_use_fontconfig = is_linux
   skia_use_freetype = is_android || is_fuchsia || is_linux
-  skia_use_giflib = !is_fuchsia
+  skia_use_giflib = true
   skia_use_libjpeg_turbo = true
   skia_use_libpng = true
   skia_use_libwebp = !is_fuchsia
@@ -342,10 +342,8 @@ optional("gif") {
   enabled = skia_use_giflib
   public_defines = [ "SK_HAS_GIF_LIBRARY" ]

[msarett, 2016/10/18 20:04:36]

Now that we don't depend on giflib, can we get rid of this define and just
always compile SkGifCodec?

Might need to grep for SK_HAS_GIF_LIBRARY and delete it from a bunch of build
files...

[scroggo_chromium, 2016/10/18 20:41:47]

Done.

 
-  deps = [
-    "//third_party/giflib",
-  ]
   sources = [
+    "src/codec/GIFImageReader.cpp",
     "src/codec/SkGifCodec.cpp",
   ]
 }