This article describes an experimental feature that we are currently exploring. If you would like to be an early adopter contact us on intercom and ask to be part of the Firebase Analytics Beta.
This will guide you through creating a Google Analytics Property for apps using Firebase Analytics.
Create Google Analytics Property
Select the Google Analytics account you will create the property in and hit "Create Property"

Select "Apps and web" from the list of property types.

Fill in your property name, industry category, and reporting timezone. Finally, click create.

Create Data Stream (Firebase Connection)
Once the property is created click into the admin and find the "Data Streams" setting for the newly created property.

When prompted to choose a platform select iOS app.

Register iOS App
Step 1: Register your app by entering the iOS bundle ID and App Store ID of your app. We will provide both of these to you. Enter an app name that is meaningful to you. Finally click "Register App"

Step 2: The next step is fully automated. Google Analytics will create Google Cloud and Firebase projects to support your app. Once these have been created and linked you will be able to click the next button.

Step 3: Download the GoogleService-Info.plist file. This file is one of two files that will need to be sent to us to complete the integration.

Steps 4 and 5: These steps are all about actually integration of the Firebase SDK. We handle this for you and you can click next.
Step 6: Click "Skip this step". We'll be able to verify the configuration at a later time.

Register the Android App
Go back to the Data Streams overview in the Google Analytics property admin and select "+ Add App".

Step 1: Select the Android platform.

Step 2: Enter the android package name for your app. We will provide you this information. Enter an App Name that is meaningful to you.

Step 3: Download the google-services.json file. This is the second file that will need to be sent to us to complete the integration.

Step 4: This step is about actually integration of the Firebase SDK. We handle this for you and you can click next.
Step 5: Click "Skip this step". We'll be able to verify the configuration at a later time.

Final Steps
Congratulations! You've successfully setup Google Analytics to collect analytics from your apps. The final step is to send us the GoogleService-Info.plist and google-services.json files that you downloaded as part of the register steps above. From there we will rebuild and re-publish your apps with Firebase Analytics integration enabled.