Mojo: (Theoretically) implement sending PlatformHandles (i.e., FDs) across a RawChannel on POSIX.

The read side isn't implemented yet, so I can't test it yet.

R=yzshen@chromium.org

Review URL: https://codereview.chromium.org/279613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269412 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed