Change ErrorCode into an enum class. This change is needed in order for us to be able to import ErrorCode symbols from chromeos_update_engine into chromeos_update_manager. Unfortunately, shifting from plain 'enum' into an 'enum class' means that the compiler treats the new class as a distinct type from int, which in turn means that plenty of seamless arithmetic/bitwise operations we used for manipulating error code values throughout the code needed to be retrofitted with static_cast operators. In the future, we should consider imposing a proper abstraction on update engine error codes that'll prevent mingling with value encoding directly and prevent such nastiness. It'll also make things more coherent (types, semantics) and safer. BUG=chromium:358329 TEST=Unit tests. Change-Id: Ie55fa566b764cdab6c4785d995fb6daee4cb32d3 Reviewed-on: https://chromium-review.googlesource.com/203209 Tested-by: Gilad Arnold <garnold@chromium.org> Reviewed-by: Alex Deymo <deymo@chromium.org> Commit-Queue: Gilad Arnold <garnold@chromium.org>
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