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Currently, BrokerProcess:SIGSYS_Handler dispatches syscall numbers to
specific syscall handler, along with a couple sanity checks.

When USER_NOTIF support lands, the broker will also need to read the
syscall number and dispatch to a syscall handler. So, create an
interface that lists the syscall handlers, and deduplicate the
dispatching code.

The current implementations of the syscall dispatch functions will
be specific to BrokerClient, so move them from broker_process.cc to
broker_client.cc as they won't be used by USER_NOTIF.
This means a lot of changing open_broker.Syscall(...) to
open_broker.GetBrokerClientSignalBased()->Syscall(...) in
broker_process_unittest.cc.

Bug: 1117351
Change-Id: I830fa6d10f973cf90697c7e19b80b596ba0428b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379551
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809136}