Bug 1087872 - Tests for dynamic change of ruby frames. r=bz,dbaron

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extra : rebase_source : 4fa97f21d33e96bfc6bf8456f7ce8983e1fedee2
extra : amend_source : 5c80d0ded3816655b8f05ef44f496b2a991d6940
extra : source : ea286aab916d2a35b4a08dc808667c78d4142968