command_buffer_gles2: Fix command-line arguments if they are passed

Set the command-line arguments correctly if they are passed
with CHROME_COMMAND_BUFFER_GLES2_ARGS.

Previously the first argument would go in the place of the app name.

Also initialize the command-line on Windows.

BUG=skia:2992

Review URL: https://codereview.chromium.org/1613103002

Cr-Commit-Position: refs/heads/master@{#370930}
1 file changed