Add validateOrigin() to the support library.

customtabs/build.gradle

 apply plugin: 'android-library'
 
 dependencies {
-    compile 'com.android.support:support-annotations:22.2.0+'
-    compile 'com.android.support:support-v4:25.0.1'
+    compile 'com.android.support:support-annotations:24.2.0+'
+    compile 'com.android.support:support-v4:25.3.1'
+
+    androidTestCompile 'junit:junit:4.12'
+    androidTestCompile 'com.android.support.test:runner:0.5'
+    androidTestCompile 'com.android.support.test:rules:0.5'
 }
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    buildToolsVersion '25.0.0'
+
+    defaultConfig {
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
 
     sourceSets {
         main.manifest.srcFile 'AndroidManifest.xml'
         main.java.srcDirs = ['src']
         main.aidl.srcDirs = ['src']
         main.res.srcDir 'res'
         main.assets.srcDir 'assets'
         main.resources.srcDir 'java'
 
         androidTest.setRoot('tests')
         androidTest.java.srcDir('tests/src/')
     }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_7
         targetCompatibility JavaVersion.VERSION_1_7
     }
 }