api + plugins examples

Summary:
Initial commit for Flipper API for JS apps:
1) Plugin, Connection, Client
2) a bridge to work with WebView proxy app
3) examples of ported plugins: AnalyticsLogging and Fury

Reviewed By: danielbuechele

Differential Revision: D16753405

fbshipit-source-id: cdd4b863db236b2043f09833aed130035f6738de

src/utils/js-client/example.js

@@ -0,0 +1,38 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+import {FlipperClient} from './api';
+import {newWebviewClient} from './webviewImpl';
+import {AnalyticsLoggingFlipperPlugin} from './plugins/analyticsLogging';
+import {FuryPlugin} from './plugins/fury';
+
+class FlipperManager {
+  flipperClient: FlipperClient;
+  analyticsPlugin: AnalyticsLoggingFlipperPlugin;
+  furyPlugin: FuryPlugin;
+
+  constructor() {
+    this.flipperClient = newWebviewClient();
+    this.analyticsPlugin = new AnalyticsLoggingFlipperPlugin();
+    this.furyPlugin = new FuryPlugin();
+    this.flipperClient.addPlugin(this.analyticsPlugin);
+    this.flipperClient.addPlugin(this.furyPlugin);
+    this.flipperClient.start();
+  }
+}
+
+let flipperManager: ?FlipperManager;
+
+export function init() {
+  if (!flipperManager) {
+    flipperManager = new FlipperManager();
+  }
+}
+
+export function flipper(): ?FlipperManager {
+  return flipperManager;
+}