Update window title for profiling builds

config/gni/devtools_grd_files.gni

@@ -842,8 +842,10 @@ grd_files_debug_sources = [
   "front_end/entrypoints/node_app/NodeConnectionsPanel.js",
   "front_end/entrypoints/node_app/NodeMain.js",
   "front_end/entrypoints/node_app/nodeConnectionsPanel.css.js",
+  "front_end/entrypoints/rn_fusebox/FuseboxAppMetadataObserver.js",
   "front_end/entrypoints/rn_fusebox/FuseboxProfilingBuildObserver.js",
   "front_end/entrypoints/rn_fusebox/FuseboxReconnectDeviceButton.js",
+  "front_end/entrypoints/rn_fusebox/FuseboxWindowTitleManager.js",
   "front_end/entrypoints/shell/browser_compatibility_guard.js",
   "front_end/entrypoints/wasmparser_worker/WasmParserWorker.js",
   "front_end/entrypoints/worker_app/WorkerMain.js",

front_end/entrypoints/rn_fusebox/BUILD.gn

@@ -9,8 +9,10 @@ import("../visibility.gni")
 
 devtools_module("rn_fusebox") {
   sources = [
+    "FuseboxAppMetadataObserver.ts",
     "FuseboxReconnectDeviceButton.ts",
     "FuseboxProfilingBuildObserver.ts",
+    "FuseboxWindowTitleManager.ts",
   ]
 
   deps = [

front_end/entrypoints/rn_fusebox/FuseboxAppMetadataObserver.ts

@@ -0,0 +1,38 @@
+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// Copyright 2024 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import * as Common from '../../core/common/common.js';
+import * as Protocol from '../../generated/protocol.js';
+import * as SDK from '../../core/sdk/sdk.js';
+import FuseboxWindowTitleManager from './FuseboxWindowTitleManager.js';
+
+/**
+ * Model observer which updates the DevTools window title based on the connected
+ * React Native app metadata.
+ */
+export default class FuseboxAppMetadataObserver implements
+    SDK.TargetManager.SDKModelObserver<SDK.ReactNativeApplicationModel.ReactNativeApplicationModel> {
+  constructor(targetManager: SDK.TargetManager.TargetManager) {
+    targetManager.observeModels(SDK.ReactNativeApplicationModel.ReactNativeApplicationModel, this);
+  }
+
+  modelAdded(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
+    model.ensureEnabled();
+    model.addEventListener(SDK.ReactNativeApplicationModel.Events.MetadataUpdated, this.#handleMetadataUpdated, this);
+  }
+
+  modelRemoved(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
+    model.removeEventListener(
+        SDK.ReactNativeApplicationModel.Events.MetadataUpdated, this.#handleMetadataUpdated, this);
+  }
+
+  #handleMetadataUpdated(
+      event: Common.EventTarget.EventTargetEvent<Protocol.ReactNativeApplication.MetadataUpdatedEvent>): void {
+    const {appDisplayName, deviceName} = event.data;
+
+    // Update window title
+    FuseboxWindowTitleManager.instance().setAppInfo(appDisplayName, deviceName);
+  }
+}

front_end/entrypoints/rn_fusebox/FuseboxProfilingBuildObserver.ts

@@ -9,6 +9,7 @@ import * as Root from '../../core/root/root.js';
 import * as SDK from '../../core/sdk/sdk.js';
 import * as UI from '../../ui/legacy/legacy.js';
 import * as i18n from '../../core/i18n/i18n.js';
+import FuseboxWindowTitleManager from './FuseboxWindowTitleManager.js';
 
 const UIStrings = {
   /**
@@ -45,6 +46,7 @@ export default class FuseboxProfilingBuildObserver implements
     const {unstable_isProfilingBuild} = event.data;
 
     if (unstable_isProfilingBuild) {
+      FuseboxWindowTitleManager.instance().setSuffix('[PROFILING]');
       this.#hideUnsupportedFeatures();
       this.#ensurePerformancePanelEnabled();
     }

front_end/entrypoints/rn_fusebox/FuseboxWindowTitleManager.ts

@@ -0,0 +1,48 @@
+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// Copyright 2024 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+export default class FuseboxWindowTitleManager {
+  static #instance: FuseboxWindowTitleManager;
+  #appDisplayName?: string;
+  #deviceName?: string;
+  #suffix?: string;
+
+  private constructor() {}
+
+  static instance(): FuseboxWindowTitleManager {
+    if (!this.#instance) {
+      this.#instance = new FuseboxWindowTitleManager();
+    }
+    return this.#instance;
+  }
+
+  setAppInfo(appDisplayName: string | undefined, deviceName: string | undefined): void {
+    this.#appDisplayName = appDisplayName;
+    this.#deviceName = deviceName;
+    this.#updateTitle();
+  }
+
+  setSuffix(suffix: string): void {
+    this.#suffix = suffix;
+    this.#updateTitle();
+  }
+
+  #updateTitle(): void {
+    const parts: string[] = [];
+
+    if (this.#appDisplayName) {
+      parts.push(this.#appDisplayName);
+    }
+    if (this.#deviceName) {
+      parts.push(`(${this.#deviceName})`);
+    }
+    if (this.#suffix) {
+      parts.push(this.#suffix);
+    }
+    parts.push('- React Native DevTools');
+
+    document.title = parts.join(' ');
+  }
+}

front_end/entrypoints/rn_fusebox/rn_fusebox.ts

@@ -23,8 +23,7 @@ import * as RNExperiments from '../../core/rn_experiments/rn_experiments.js';
 import * as SDK from '../../core/sdk/sdk.js';
 import * as UI from '../../ui/legacy/legacy.js';
 import * as Main from '../main/main.js';
-import * as Common from '../../core/common/common.js';
-import * as Protocol from '../../generated/protocol.js';
+import FuseboxAppMetadataObserver from './FuseboxAppMetadataObserver.js';
 import FuseboxReconnectDeviceButton from './FuseboxReconnectDeviceButton.js';
 import FuseboxProfilingBuildObserver from './FuseboxProfilingBuildObserver.js';
 
@@ -164,34 +163,7 @@ UI.Toolbar.registerToolbarItem({
   },
 });
 
-class FuseboxReactNativeApplicationObserver implements
-    SDK.TargetManager.SDKModelObserver<SDK.ReactNativeApplicationModel.ReactNativeApplicationModel> {
-  constructor(targetManager: SDK.TargetManager.TargetManager) {
-    targetManager.observeModels(SDK.ReactNativeApplicationModel.ReactNativeApplicationModel, this);
-  }
-
-  modelAdded(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
-    model.ensureEnabled();
-    model.addEventListener(SDK.ReactNativeApplicationModel.Events.MetadataUpdated, this.#handleMetadataUpdated, this);
-  }
-
-  modelRemoved(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
-    model.removeEventListener(
-        SDK.ReactNativeApplicationModel.Events.MetadataUpdated, this.#handleMetadataUpdated, this);
-  }
-
-  #handleMetadataUpdated(
-      event: Common.EventTarget.EventTargetEvent<Protocol.ReactNativeApplication.MetadataUpdatedEvent>): void {
-    const {appDisplayName, deviceName} = event.data;
-
-    // Update window title
-    if (appDisplayName !== null && appDisplayName !== undefined) {
-      document.title = `${appDisplayName}${deviceName !== null && deviceName !== undefined ? ` (${deviceName})` : ''} - React Native DevTools`;
-    }
-  }
-}
-
-new FuseboxReactNativeApplicationObserver(SDK.TargetManager.TargetManager.instance());
+new FuseboxAppMetadataObserver(SDK.TargetManager.TargetManager.instance());
 new FuseboxProfilingBuildObserver(SDK.TargetManager.TargetManager.instance());
 
 Host.rnPerfMetrics.entryPointLoadingFinished('rn_fusebox');