Render Webview

Summary: When Trace has been uploaded, load it inside a webview in Flipper.

Reviewed By: habond

Differential Revision: D16185763

fbshipit-source-id: 3217211f1d5035fc16d733ef48db44d8f8d9d360

static/index.js

@@ -252,6 +252,7 @@ function tryCreateWindow() {
         scrollBounce: true,
         experimentalFeatures: true,
         nodeIntegration: true,
+        webviewTag: true,
       },
     });
     win.once('ready-to-show', () => win.show());