Update build.gradle with androidx version vars

Author: rupeshkumar22

build.gradle

@@ -26,6 +26,7 @@ allprojects {
     versions.load(project.rootProject.file("mode/version.properties").newDataInputStream())
     ext.targetSdkVersion = versions.getProperty("android-platform")
     ext.supportLibsVersion = versions.getProperty("com.android.support%support-v4")
+    ext.supportLibsVersionAndroidX=versions.getProperty("androidx.appcompat%appcompat")
     ext.wearVersion = versions.getProperty("com.google.android.support%wearable")
     ext.gvrVersion = versions.getProperty("com.google.vr")
     ext.garVersion = versions.getProperty("com.google.ar")
@@ -39,6 +40,7 @@ allprojects {
     Properties modeProperties = new Properties()
     modeProperties.load(project.rootProject.file("mode/mode.properties").newDataInputStream())
     ext.modeVersion = modeProperties.getProperty("prettyVersion")
+    ext.modeVersionAndroidX = modeProperties.getProperty("prettyVersionAndroidX")
 
     Properties vrProperties = new Properties()
     vrProperties.load(project.rootProject.file("mode/libraries/vr/library.properties").newDataInputStream())
@@ -49,6 +51,7 @@ allprojects {
     ext.arLibVersion = arProperties.getProperty("prettyVersion")
 
 
+
     def fn = project.rootProject.file("local.properties")
     if (!fn.exists()) {
         if (System.env["ANDROID_SDK"] != null) {