Add some plumbing for in-progress work on enabling SSL proxy support.

BUG=29625
TEST=none

Review URL: http://codereview.chromium.org/2832057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53061 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed