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Forced commit only should proceed to its BeginMainFrame when there is a
scheduled BeginMainFrame().
So, Forced commit only should wait for COMMIT_STATE_BEGIN_MAIN_FRAME_SENT.

R=brianderson@chromium.org
BUG=350585
TEST=cc_unittests

Review URL: https://codereview.chromium.org/189553007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255894 0039d316-1c4b-4281-b951-d872f2087c98