Network plugin - support mocks in imported devices (#2040)

Summary:
It is not currently possible to create mock routes from imported network logs.  This PR will provide that functionality.

See this issue for more details: https://github.com/facebook/flipper/issues/1988

## Changelog

Network plugin - create mocks from imported network logs

Pull Request resolved: https://github.com/facebook/flipper/pull/2040

Test Plan:
Use sample app to create network activity
Export network activity
Import network activity
Create mocks from imported network activity
Verify that mocks work using sample app

Reviewed By: mweststrate

Differential Revision: D26947187

Pulled By: passy

fbshipit-source-id: 5e4e0197c49bb7a8227a70e574613381815e6d30

desktop/plugins/network/index.tsx

@@ -44,7 +44,13 @@ import {clipboard} from 'electron';
 import {URL} from 'url';
 import {MockResponseDialog} from './MockResponseDialog';
 import {combineBase64Chunks} from './chunks';
-import {PluginClient, createState, usePlugin, useValue} from 'flipper-plugin';
+import {
+  PluginClient,
+  Device,
+  createState,
+  usePlugin,
+  useValue,
+} from 'flipper-plugin';
 import {remote, OpenDialogOptions} from 'electron';
 import fs from 'fs';
 import electron from 'electron';
@@ -325,8 +331,16 @@ export function plugin(client: PluginClient<Events, Methods>) {
     });
   }
 
+  function supportsMocks(device: Device): Promise<boolean> {
+    if (device.isArchived) {
+      return Promise.resolve(true);
+    } else {
+      return client.supportsMethod('mockResponses');
+    }
+  }
+
   function init() {
-    client.supportsMethod('mockResponses').then((result) => {
+    supportsMocks(client.device).then((result) => {
       const newRoutes = JSON.parse(
         localStorage.getItem(LOCALSTORAGE_MOCK_ROUTE_LIST_KEY + client.appId) ||
           '{}',
@@ -552,6 +566,7 @@ export function plugin(client: PluginClient<Events, Methods>) {
         JSON.stringify(routesValuesArray),
       );
 
+      if (!client.device.isArchived) {
         try {
           await client.send('mockResponses', {
             routes: routesValuesArray
@@ -570,6 +585,7 @@ export function plugin(client: PluginClient<Events, Methods>) {
         }
       }
     }
+  }
 
   return {
     selectedIds,