Bug 734691 - Add multi-thread support to profiler r=benwa

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extra : rebase_source : 8367dc61f9f9026d0110ffe43d5d4d0aa9129e24
Bug 734691 - Port multi-thread support to win/mac. r=snorp,smaug

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extra : rebase_source : 172d75f2183c5ba50ce709aeefcd3534a35724e5