Rename GIFImageReader to SkGifImageReader

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
 }
@@ skipping 523 matching lines @@
     "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/gif/SkGifImageReader.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 690 matching lines @@
       ]
       if (is_android) {
         deps += [ "//third_party/native_app_glue" ]
       } else if (is_mac) {
         deps += [ "//third_party/libsdl" ]
       }
       testonly = true
     }
   }
 }