Move the code that writes the temporary shader file to the shader compiler. BUG=angle:755 Change-Id: I5fdc3ae112ea3f59694a22da6199b99a568ed0a1 Reviewed-on: https://chromium-review.googlesource.com/219530 Reviewed-by: Brandon Jones <bajones@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>