Add validateOrigin() to the support library.

demos/build.gradle

 apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "org.chromium.customtabsdemos"
         minSdkVersion 15
         targetSdkVersion 23
         versionCode 1
         versionName "1.0"
     }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
 }
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:23.2.0'
     compile 'com.android.support:recyclerview-v7:23.2.0'
     compile 'com.android.support:customtabs:23.2.0'
     compile project(':shared')
 }