Bug 944665: Part 1: Move common initialization routine into a function. r=khuey
Bug 944665: Part 2: Call PreloadSlowThings after Nuwa fork. r=khuey
Bug 922465: Test Nuwa creation. r=khuey
Bug 930282: Part 1: Enable Nuwa by default. r=khuey
Bug 930282: Part 2: Mark PACMan thread and BackgroundHangMonitor thread. r=khuey