Add support for multiple frames in SkCodec

cmake/CMakeLists.txt

 # Boilerplate.
 cmake_minimum_required (VERSION 3.1)   # First version with CMAKE_CXX_STANDARD.
 project (skimake)
 set (CMAKE_CXX_STANDARD 11)
 
 # Default to Release mode.  We're mainly targeting Skia users, not Skia developers.
 if (NOT CMAKE_BUILD_TYPE)
     set (CMAKE_BUILD_TYPE Release)
 endif ()
 
@@ skipping 169 matching lines @@
 else()
     remove_srcs (../src/ports/SkFontMgr_android_parser.cpp)
 endif()
 
 if (GIF_FOUND)
     list (APPEND private_includes ${GIF_INCLUDE_DIRS})
     list (APPEND libs             ${GIF_LIBRARIES})
     add_definitions(-DSK_HAS_GIF_LIBRARY)
 else()
     remove_srcs(../src/images/*GIF*)
-    remove_srcs(../src/codec/*Gif*)
 endif()
 
 if (JPEG_TURBO_FOUND)
     list (APPEND private_includes ${JPEG_TURBO_INCLUDE_DIRS})
     list (APPEND libs             ${JPEG_TURBO_LIBRARIES})
     add_definitions(-DSK_HAS_JPEG_LIBRARY)
 else()
     remove_srcs(../src/images/*JPEG*)
     remove_srcs(../src/codec/*Jpeg*)
 endif()
@@ skipping 157 matching lines @@
         file (APPEND ${skia_h_path} "#include \"${filename_component}\"\n")
       endif ()
     endforeach()
   endif()
 endforeach()
 file(APPEND ${skia_h_path} "\n#endif  // skia_DEFINED\n")
 
 # Now build a simple example app that uses Skia via libskia.so.
 add_executable(example example.cpp)
 target_link_libraries(example skia ${OPENGL_LIBRARIES})