Move SkJSONCPP.h to tools. It tool-only.

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 315 matching lines @@
   get_filename_component (abs_include ${include} ABSOLUTE)
   file (APPEND ${compile_arguments} "-I${abs_include}\n")
 endforeach()
 
 # cmake .
 # cmake --build . --target skia
 # c++ -c @skia_compile_arguments.txt example.cpp
 # c++ example.o @skia_link_arguments.txt
 
 # skia.h
-set (bad_files GrGLConfig_chrome.h SkJSONCPP.h SkParsePaint.h)
+set (bad_files GrGLConfig_chrome.h)
 # make `c++ @skia_compile_arguments.txt include/skia.h` work.
 set (skia_h_path ${userconfig_directory}/skia.h)
 file (WRITE ${skia_h_path} "// skia.h generated by CMake.\n")
 file(APPEND ${skia_h_path} "#ifndef skia_DEFINED\n")
 file(APPEND ${skia_h_path} "#define skia_DEFINED\n")
 foreach (include ${public_includes})
   if (NOT include STREQUAL userconfig_directory)
     file (APPEND ${skia_h_path} "\n")
     file (GLOB all_public_headers ${include}/*.h)
     foreach (public_header ${all_public_headers})
       get_filename_component (filename_component ${public_header} NAME)
       if (NOT ";${bad_files};" MATCHES ";${filename_component};")
         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})