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I'm planning on comsolidating the platform-independent management of the
overflow buffer and message dispatch between the posix and windows channels.
This patch separates out the behavior into the functions I'm planning on adding
on the virtual interface.

Basically, ProcessIncomingMessages and DispatchInputData will be the main
shared code. In future patches, I'll refactor Windows in a similar way and then
combine them into a shared base class.


Review URL: http://codereview.chromium.org/9570001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124489 0039d316-1c4b-4281-b951-d872f2087c98