PNaCl TOOL_REVISIONS: add the --svn-id option
PNaCl TOOL_REVISIONS: add the --svn-id option

This option is useful to update to a changelist that isn't the latest
PNaCl change, for example when multiple changelists' toolchain builds
were merged, or when too many PNaCl changes would be pulled in at the
same time.

R=dschuff@chromium.org, jvoung@chromium.org

Review URL: https://codereview.chromium.org/134823002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12599 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client