client api: Introduce a bare-bones TrackEvent library

This patch adds a basic TrackEvent library to serve as a higher level
entrypoint into Perfetto for apps that wish to record various types of
events on a timeline. For now, the library only supports explicit
Begin/End slice events with static categories and names. Note that
enabling trace points based on their categories isn't supported yet.

Bug: 132678367
Change-Id: If72eb0c0cba565303b0a778933931609043c5004
diff --git a/test/fake_producer.cc b/test/fake_producer.cc
index 0df0b71..73457c4 100644
--- a/test/fake_producer.cc
+++ b/test/fake_producer.cc
@@ -20,7 +20,7 @@
 #include <mutex>
 
 #include "perfetto/base/logging.h"
-#include "perfetto/ext/base/time.h"
+#include "perfetto/base/time.h"
 #include "perfetto/ext/base/utils.h"
 #include "perfetto/ext/traced/traced.h"
 #include "perfetto/ext/tracing/core/trace_packet.h"