Add StringInterner for heapprofd.

This will be needed to inline names for objects and methods.

Change-Id: I82f5326da5cbff01e2dad211a242eed810e1c49c
diff --git a/Android.bp b/Android.bp
index f3c36ec..1f97a6a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -3691,6 +3691,8 @@
     "src/perfetto_cmd/rate_limiter_unittest.cc",
     "src/profiling/memory/record_reader.cc",
     "src/profiling/memory/record_reader_unittest.cc",
+    "src/profiling/memory/string_interner.cc",
+    "src/profiling/memory/string_interner_unittest.cc",
     "src/protozero/message.cc",
     "src/protozero/message_handle.cc",
     "src/protozero/message_handle_unittest.cc",