Send CloseableRef leaks to Flipper plugin (#455)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/455

Only logging to the console for now, but it's a good start.

Reviewed By: oprisnik

Differential Revision: D15535820

fbshipit-source-id: 8531ec5ef681d01b2428a1f016b2a1d9f1589a34

src/plugins/fresco/api.js

@@ -67,3 +67,8 @@ export type ImageEvent = {
 export type FrescoDebugOverlayEvent = {|
   enabled: boolean,
 |};
+
+export type AndroidCloseableReferenceLeakEvent = {|
+  identityHashCode: string,
+  className: string,
+|};