perfetto_cmd: Add cmdline flags

Add an atrace style interface to the perfetto command line.
This allows users to take a ftrace/atrace trace without writing
out a config.

Bug: 117592083
Change-Id: I07efcbf2feee309190cb97cd0eedde0ced4106aa
diff --git a/Android.bp b/Android.bp
index f265d74..147384b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -343,6 +343,7 @@
     "src/ipc/host_impl.cc",
     "src/ipc/service_proxy.cc",
     "src/ipc/virtual_destructors.cc",
+    "src/perfetto_cmd/config.cc",
     "src/perfetto_cmd/main.cc",
     "src/perfetto_cmd/pbtxt_to_pb.cc",
     "src/perfetto_cmd/perfetto_cmd.cc",
@@ -2283,6 +2284,8 @@
     "src/ipc/service_proxy.cc",
     "src/ipc/test/ipc_integrationtest.cc",
     "src/ipc/virtual_destructors.cc",
+    "src/perfetto_cmd/config.cc",
+    "src/perfetto_cmd/config_unittest.cc",
     "src/perfetto_cmd/pbtxt_to_pb.cc",
     "src/perfetto_cmd/pbtxt_to_pb_unittest.cc",
     "src/perfetto_cmd/perfetto_cmd.cc",