Fixes to the standalone Linux build. Several small build errors present on Linux cropped up due to different warning flags and platform quirks. BUG=angle:627 Change-Id: If8f651cacf05bb06ecb129be47b12729ccc3f69b Reviewed-on: https://chromium-review.googlesource.com/197724 Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>