GitLab

Move the TestSink for doing IPC tests from chrome/common into IPC and create a new IPC test_support project that references it.

This is necessary because I want to make a test that uses the sink outside of chrome.

TEST=this is a test
BUG=none
Review URL: http://codereview.chromium.org/6290008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72044 0039d316-1c4b-4281-b951-d872f2087c98