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,
+|};

src/plugins/fresco/index.js

@@ -12,6 +12,7 @@ import type {
   ImagesListResponse,
   ImageEvent,
   FrescoDebugOverlayEvent,
+  AndroidCloseableReferenceLeakEvent,
   CacheInfo,
 } from './api.js';
 import type {ImagesMap} from './ImagePool.js';
@@ -225,6 +226,13 @@ export default class extends FlipperPlugin<PluginState, *, PersistedState> {
         this.setState({isDebugOverlayEnabled: event.enabled});
       },
     );
+    this.client.subscribe(
+      'closeable_reference_leak_event',
+      (event: AndroidCloseableReferenceLeakEvent) => {
+        // TODO(T45065440): Temporary log, to be turned into counter.
+        console.warn('CloseableReference leak detected:', event);
+      },
+    );
     this.imagePool = new ImagePool(this.getImage, (images: ImagesMap) =>
       this.props.setPersistedState({imagesMap: images}),
     );