added firebase performance matrix

Author: jiangshen

app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.application'
+apply plugin: 'com.google.firebase.firebase-perf'
 
 android {
     compileSdkVersion 26
@@ -37,6 +38,7 @@ dependencies {
     compile 'com.google.firebase:firebase-auth:11.6.2'
     compile 'com.google.android.gms:play-services-auth:11.6.2'
     compile 'com.google.firebase:firebase-database:11.6.2'
+    compile 'com.google.firebase:firebase-perf:11.6.2'
     compile 'com.android.support:appcompat-v7:26.1.0'
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
     compile 'com.github.QuadFlask:colorpicker:0.0.13'

build.gradle

@@ -8,6 +8,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.1'
         classpath 'com.google.gms:google-services:3.1.0'
+        classpath 'com.google.firebase:firebase-plugins:1.1.5'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files