Android app with Gradle in Eclipse

Greetings!
I just started my internship in a company that develops android applications., but i have a problem. My boss insists that i work in Eclipse, but I'm unable to follow instructions from android developers site because my eclipse app doesnt have gradle.

To be precise, my job is to implement push messages into existing app but I'm stuck at these lines:

Add the dependency to your project-level build.gradle:
classpath 'com.google.gms:google-services:1.5.0-beta2'

Add the plugin to your app-level build.gradle:
apply plugin: 'com.google.gms.google-services'

dependencies {
compile "com.google.android.gms:play-services:8.4.0"
}

Is there a way to work around using gradle, and do this other way, or alternatively is there a way to add build.gradle files to my project.

I'm pretty worried because this is my first job, and I'd like to do and learn as much as possible but I'm just stuck. If someone could explain to me step by step what to do I would appreciate it immensely.

Thanks