perfetto: add end to end integration tests

These tests will run on a new target known as perfetto_integrationtests
with perfetto_tests renamed to perfetto_unittests.

Change-Id: I467eafd84cade516861f79295f06bb0768e46a30
diff --git a/src/ftrace_reader/BUILD.gn b/src/ftrace_reader/BUILD.gn
index 94a9e57..5890d21 100644
--- a/src/ftrace_reader/BUILD.gn
+++ b/src/ftrace_reader/BUILD.gn
@@ -66,7 +66,7 @@
 
 # These tests require access to a real ftrace implementation and must
 # run with sudo.
-executable("ftrace_reader_integrationtests") {
+source_set("ftrace_reader_integrationtests") {
   testonly = true
   deps = [
     ":ftrace_reader",