Move Skia initialization out of the GUI widget class to the
main function.
Before, Skia may have been already called before the SkGraphics::Init
was run.
Review URL: https://codereview.chromium.org/822583003
QApplication forces the process to use the C locale system on
"Unix/Linux" according to the docs.
The float numbers in GL shaders will be printed with printf. These will
be formatted with comma in certain locales, like LC_NUMERIC=fi_FI.UTF-8.
Force the NC_NUMERIC=C before running the QApplication.
Review URL: https://codereview.chromium.org/724753002
