Add TestFailingCompletionHandlerCrashesProcess Test#2309

kythant wants to merge 2 commits intostaging/3.0microsoft/CsWinRT:staging/3.0from

user/kythant/TestFailingCompletionHandlerCrashesProcessmicrosoft/CsWinRT:user/kythant/TestFailingCompletionHandlerCrashesProcessCopy head branch name to clipboard