Function for on-demand flamegraph for heap graph.

Change-Id: If83cda516d288f18a95d7fbd13f3b08d12fc56ec
diff --git a/Android.bp b/Android.bp
index d721882..2e749e4 100644
--- a/Android.bp
+++ b/Android.bp
@@ -6096,6 +6096,7 @@
     "src/trace_processor/heap_profile_tracker_unittest.cc",
     "src/trace_processor/importers/fuchsia/fuchsia_trace_utils_unittest.cc",
     "src/trace_processor/importers/proto/args_table_utils_unittest.cc",
+    "src/trace_processor/importers/proto/heap_graph_tracker_unittest.cc",
     "src/trace_processor/importers/proto/heap_graph_walker_unittest.cc",
     "src/trace_processor/importers/proto/proto_trace_parser_unittest.cc",
     "src/trace_processor/importers/systrace/systrace_parser_unittest.cc",