Track time for exports

Summary:
This sometimes take *A LONG* time for me, so I want to
know if I'm an outlier or not.

Reviewed By: jknoxville

Differential Revision: D15939147

fbshipit-source-id: 9ebd3914efdd537eeadd49e522397acc97a6ff9c

src/App.js

@@ -83,7 +83,11 @@ export class App extends React.Component<Props> {
         return <SignInSheet onHide={onHide} />;
       case ACTIVE_SHEET_SHARE_DATA_IN_FILE:
         return (
-          <ShareSheetExportFile onHide={onHide} file={this.props.exportFile} />
+          <ShareSheetExportFile
+            onHide={onHide}
+            file={this.props.exportFile}
+            logger={this.props.logger}
+          />
         );
       case ACTIVE_SHEET_PLUGIN_SHEET:
         // Currently unused.

src/chrome/ShareSheetExportFile.js

@@ -16,6 +16,9 @@ import {
   Spacer,
 } from 'flipper';
 import {reportPlatformFailures} from '../utils/metrics';
+// $FlowFixMe: Missing type defs for node built-in.
+import {performance} from 'perf_hooks';
+import type {Logger} from '../fb-interfaces/Logger.js';
 import {
   exportStoreToFile,
   EXPORT_FLIPPER_TRACE_EVENT,
@@ -66,6 +69,7 @@ const Padder = styled('div')(
 type Props = {
   onHide: () => mixed,
   file: ?string,
+  logger: Logger,
 };
 type State = {
   errorArray: Array<Error>,
@@ -86,18 +90,23 @@ export default class ShareSheetExportFile extends Component<Props, State> {
   };
 
   async componentDidMount() {
-    if (!this.props.file) {
+    const mark = 'shareSheetExportFile';
-      return;
+    performance.mark(mark);
-    }
-
     try {
+      // Flow doesn't allow us to check for this earlier because `performance` is untyped
+      // and could presumably do anything.
+      if (!this.props.file) {
+        return;
+      }
       const {errorArray} = await reportPlatformFailures(
         exportStoreToFile(this.props.file, this.context.store),
         `${EXPORT_FLIPPER_TRACE_EVENT}:UI_FILE`,
       );
       this.setState({errorArray, result: {success: true, error: null}});
+      this.props.logger.trackTimeSince(mark, 'export:file-success');
     } catch (err) {
       this.setState({errorArray: [], result: {success: false, error: err}});
+      this.props.logger.trackTimeSince(mark, 'export:file-error');
     }
   }
 

src/utils/exportData.js

@@ -25,7 +25,6 @@ import {readCurrentRevision} from './packageMetadata.js';
 import {tryCatchReportPlatformFailures} from './metrics';
 import {promisify} from 'util';
 import promiseTimeout from './promiseTimeout';
-import type {State} from '../reducers';
 
 export const IMPORT_FLIPPER_TRACE_EVENT = 'import-flipper-trace';
 export const EXPORT_FLIPPER_TRACE_EVENT = 'export-flipper-trace';