Use the GL in process bindings directly in cc_unittests

This binds cc_unittests to the GL in process command buffer bindings directly
instead of relying on the setup in webkit/common/gpu.

BUG=181120

Review URL: https://codereview.chromium.org/105303003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242005 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242005