[RUM 16664] Report TTID and TTFD on RN apps

[sbarrio]

What does this PR do?

TTID reporting

This PR integrates the com.datadoghq:dd-sdk-android-rum-prelaunch module that was added to the Android SDK here: DataDog/dd-sdk-android#3635

As such, this PR also bumps the native Android SDK to version 3.15.0.

This module integrates a way for Cross Platform SDKs to reliably obtain a TTID measurement without having to rely on the native Android SDK being initialized as early as possible, which is something that on most RN apps will not be possible as the first Activity will most probably have rendered its first frame way before the RN bridge has started and the host app has initialized the RN SDK. For more details on the implementation please check the PR linked above.

TTFD reporting

Second, this PR exposes the manual reportAppFullyDisplayed API, which allows for host apps to decide when an app has completed it's first display and report that timestamp back to Datadog to be presented on the Dashboard as the TTFD value for that session alongside its TTID.

Motivation

TTID and TTFD vitals have been reported consistently on native SDKs for a while now but the RN SDK lacked propert support for them. This PR solves this.

Additional Notes

Android

iOS

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[datadog-prod-us1-4]

✅ All CI checks and tests passed.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

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[Copilot]

🔵 Needs a closer look

Cross-platform startup instrumentation and native bridge changes require final device and build validation.

0 open findings

What changed in this PR

Adds Android TTID collection and exposes manual TTFD reporting across React Native architectures.

Changes:

• Upgrades Android Datadog dependencies and adds RUM prelaunch.
• Adds reportAppFullyDisplayed() with native bridges and tests.
• Updates example apps and iOS generated project metadata.

File	Description
packages/​react-native-webview/​android/​build.gradle	Upgrades WebView SDK.
packages/​react-native-session-replay/​android/​build.gradle	Upgrades replay SDK and removes mavenLocal.
packages/​internal-testing-tools/​android/​build.gradle	Upgrades core SDK.
packages/​core/​src/​specs/​NativeDdRum.ts	Extends the native specification.
packages/​core/​src/​rum/​types.ts	Exposes the public TTFD API.
packages/​core/​src/​rum/​DdRum.ts	Implements buffered TTFD reporting.
packages/​core/​src/​rum/​__tests__/​DdRum.test.ts	Tests JavaScript delegation.
packages/​core/​jest/​mock.js	Updates the package mock.
packages/​core/​ios/​Tests/​MockRUMMonitor.swift	Records TTFD calls in tests.
packages/​core/​ios/​Tests/​DdRumTests.swift	Tests iOS delegation.
packages/​core/​ios/​Sources/​DdRumImplementation.swift	Calls the iOS RUM monitor.
packages/​core/​ios/​Sources/​DdRum.mm	Exports the iOS bridge method.
packages/​core/​android/​src/​test/​kotlin/​com/​datadog/​tools/​unit/​MockRumMonitor.kt	Updates the Android monitor mock.
packages/​core/​android/​src/​test/​kotlin/​com/​datadog/​reactnative/​DdRumTest.kt	Tests Android delegation.
packages/​core/​android/​src/​oldarchCommon/​kotlin/​com/​datadog/​reactnative/​DdRum.kt	Exposes the old-architecture method.
packages/​core/​android/​src/​newarch/​kotlin/​com/​datadog/​reactnative/​DdRum.kt	Exposes the new-architecture method.
packages/​core/​android/​src/​main/​kotlin/​com/​datadog/​reactnative/​DdRumImplementation.kt	Calls the Android RUM monitor.
packages/​core/​android/​build.gradle	Upgrades SDKs and adds RUM prelaunch.
packages/​core/​__mocks__/​react-native.ts	Updates the typed React Native mock.
example/​src/​ddUtils.tsx	Demonstrates TTFD with legacy initialization.
example/​src/​App.tsx	Demonstrates TTFD with the provider.
example/​ios/​Podfile.lock	Updates the RCT-Folly checksum.
example/​ios/​DdSdkReactNativeExample.xcodeproj/​project.pbxproj	Adds Swift library search paths.
example-new-architecture/​ios/​Podfile.lock	Updates the RCT-Folly checksum.
example-new-architecture/​ios/​DdSdkReactNativeExample.xcodeproj/​project.pbxproj	Adds Swift library search paths.
example-new-architecture/​App.tsx	Demonstrates TTFD reporting.
benchmarks/​ios/​Podfile.lock	Updates the RCT-Folly checksum.
benchmarks/​ios/​BenchmarkRunner.xcodeproj/​project.pbxproj	Adds Swift library search paths.
benchmarks/​android/​app/​build.gradle	Upgrades benchmark SDK dependencies.

🧠 Review effort: Balanced

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