Adds protos for memory dump.

Adds memory_graph.proto and extends process_stats.proto, smaps.proto to serialize data needed due to Memory-infra migration to Perfetto. See crbug.com/1098746 for more details.

Bug: 1098746
Change-Id: I6c395b485f7fadd27e6d933e928db18a9ac2177b
diff --git a/BUILD b/BUILD
index d4b4045..1ad5aea 100644
--- a/BUILD
+++ b/BUILD
@@ -2372,6 +2372,7 @@
     name = "protos_perfetto_trace_non_minimal_protos",
     srcs = [
         "protos/perfetto/trace/extension_descriptor.proto",
+        "protos/perfetto/trace/memory_graph.proto",
         "protos/perfetto/trace/test_event.proto",
         "protos/perfetto/trace/trace.proto",
         "protos/perfetto/trace/trace_packet.proto",