Thanks for pointing that out Jason. But I found those instructions to be confusing and incomplete.
Let take this apart a bit.
What Firebase says it needs:
1. Include the "GoogleService-Info.plist" file to the project.
For this I copied the file to src/ios/chrome/app/ and added the source on the src/ios/chrome/app/BUILD.gn file.
2. Add the framework files to the project.
Since I don't feel it can be added with cocoapods, I am trying to use the manual way. The instructions are long and require a lot of other things I have no idea how to achieve on the chromium project. Such as:
a. Where do I add the .framework files on the chromium directory?
b. How do I enable -ObjC flag.
3. Import and initialize. No idea how to even import this newly added framework. I somehow feel @import Firebase; (as explained by the Firebase documentation) will not be enough.
Did you manage to get these working, Alex?