Expand modulate, add, subtract, extract component glsl helpers.

gyp/gpu.gypi

 # Include this gypi to include all 'gr' and 'skgr' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
 #
 {
   'variables': {
     'gr_sources': [
@@ skipping 153 matching lines @@
       '<(skia_src_path)/gpu/gl/GrGLProgram.h',
       '<(skia_src_path)/gpu/gl/GrGLProgramDesc.cpp',
       '<(skia_src_path)/gpu/gl/GrGLProgramDesc.h',
       '<(skia_src_path)/gpu/gl/GrGLRenderTarget.cpp',
       '<(skia_src_path)/gpu/gl/GrGLRenderTarget.h',
       '<(skia_src_path)/gpu/gl/GrGLShaderBuilder.cpp',
       '<(skia_src_path)/gpu/gl/GrGLShaderBuilder.h',
       '<(skia_src_path)/gpu/gl/GrGLShaderVar.h',
       '<(skia_src_path)/gpu/gl/GrGLSL.cpp',
       '<(skia_src_path)/gpu/gl/GrGLSL.h',
+      '<(skia_src_path)/gpu/gl/GrGLSL_impl.h',
       '<(skia_src_path)/gpu/gl/GrGLStencilBuffer.cpp',
       '<(skia_src_path)/gpu/gl/GrGLStencilBuffer.h',
       '<(skia_src_path)/gpu/gl/GrGLTexture.cpp',
       '<(skia_src_path)/gpu/gl/GrGLTexture.h',
       '<(skia_src_path)/gpu/gl/GrGLUtil.cpp',
       '<(skia_src_path)/gpu/gl/GrGLUtil.h',
       '<(skia_src_path)/gpu/gl/GrGLUniformManager.cpp',
       '<(skia_src_path)/gpu/gl/GrGLUniformManager.h',
       '<(skia_src_path)/gpu/gl/GrGLUniformHandle.h',
       '<(skia_src_path)/gpu/gl/GrGLVertexArray.cpp',
@@ skipping 88 matching lines @@
       '<(skia_src_path)/gpu/gl/SkNullGLContext.cpp',
     ],
   },
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: