tree b45619111b1bf3107d38cde4b455922164b45ddb
parent 9839b4d3c2fa9c0ee650b1d2d60ee0a1f98a1f45
author Chinglin Yu <chinglinyu@google.com> 1708501783 +0800
committer Chinglin Yu <chinglinyu@google.com> 1708501783 +0800

Implement clock sync in multi-machine tracing

This revision implements the RelayPort exposed on the producer socket
for synchronization of clocks in multi-machine tracing:

* The RelayPort defines the IPC methods between the tracing service and
the relay service for operations that are specific to multi-machine
tracing (clock synchronization).

* ServiceIPCHostImpl exposes a second IPC service that implements
RelayPort to producer sockets (perfetto::RelayIPCService).

* The relay service connects to the RelayPort using the IPC client
implementation (perfetto::RelayIPCClient). On connected, the relay
service invokes the SyncClock() rpc methods with the tracing service to
capture clock snapshots on the host and client.

* In a tracing session, the tracing service emits the ClockSnapshots
packet for the remote machine and also the ClockSync packet for the
clock offsets of supported clocks.

Bug: 284258446
Test: unit tests and integration tests.

Change-Id: I95015c1e0bc8bec7b82b0fdac897900e0de923b7