Add a new flag to use ctmalloc in BlockHeapManager.

This feature isn't supported yet, but I plan to plug it soon and then we'll have a flag to control it.

BUG=
R=chrisha@chromium.org

Review URL: https://codereview.appspot.com/124550044

git-svn-id: http://sawbuck.googlecode.com/svn/trunk@2261 15e8cca8-e42c-11de-a347-f34a4f72eb7d
8 files changed