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Adds a new client API which allows causing an exception in another process. This is accomplished by injecting a thread that calls RaiseException(). A special exception code is used that indicates to the handler that the exception arguments contain a thread id and exception code, which are in turn used to fabricate an exception record. This is so that the API can allow the client to "blame" a particular thread in the target process. The target process must also be a registered Crashpad client, as the normal exception mechanism is used to handle the exception. The injection of a thread is used instead of DebugBreakProcess() which does not cause the UnhandledExceptionFilter() to be executed. NtCreateThreadEx() is used in lieu of CreateRemoteThread() as it allows passing of a flag which avoids calling DllMain()s. This is necessary to allow thread creation to succeed even when the target process is deadlocked on the loader lock. BUG=crashpad:103 Change-Id: I797007bd2b1e3416afe3f37a6566c0cdb259b106 Reviewed-on: https://chromium-review.googlesource.com/339263 Reviewed-by: Mark Mentovai <mark@chromium.org>