Define DEBUG_GL_COMMANDS only in debug builds.
https://bugs.webkit.org/show_bug.cgi?id=74083

Reviewed by Noam Rosenthal.

No tests added as this change does not affect functionality.

* platform/graphics/opengl/TextureMapperGL.cpp:


git-svn-id: svn://svn.chromium.org/blink/trunk@102359 bbb929c8-8fbe-4397-9dbb-9b2b20218538
    TextureMapperGLData()
        : currentProgram(TextureMapperGLData::GlobalGLData::NoProgram)
    { }

    TextureMapperGLData()
        : currentProgram(TextureMapperGLData::GlobalGLData::NoProgram)
    { }
