Avoid deadlock with the UI thread and NPAPI in more cases
By doing the following: 1) Avoid deferring commits until draw if not drawing soon. 2) Don't send BeginMainFrame if swap throttling will block commit. As a side-effect, some of the changes will also help release the main thread sooner in some cases where we were holding on to it for too long. Additional scheduler deadlock tests added to verify existing and future operation. This should also enable us to more easily avoid unconditionally setting active_tree_needs_first_draw_ to false in SchedulerStateMachine::UpdateStateOnInvalidateOutputSurface in followup patches if we want to. BUG=479671, 477082 Review URL: https://codereview.chromium.org/1139613003 Cr-Commit-Position: refs/heads/master@{#330808}
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