SF: Save proto traces to a specific path

Test: presubmit
Bug: 200284593

Change-Id: I6987329cc32b2ca13e76e957a5ae6b17bbed6e83
diff --git a/services/surfaceflinger/Tracing/LayerTracing.h b/services/surfaceflinger/Tracing/LayerTracing.h
index bd448c9..88a19ec 100644
--- a/services/surfaceflinger/Tracing/LayerTracing.h
+++ b/services/surfaceflinger/Tracing/LayerTracing.h
@@ -43,7 +43,7 @@
     LayerTracing(SurfaceFlinger& flinger);
     ~LayerTracing();
     bool enable();
-    bool disable();
+    bool disable(std::string filename = FILE_NAME);
     bool isEnabled() const;
     status_t writeToFile();
     LayersTraceFileProto createTraceFileProto() const;