TBR website: using sdkmanager plugin for testing so we don't need
to presetup android sdk on test runners.

Change-Id: Ic79fddedf3e82381b655537e6a34889129849af2
diff --git a/tools/android_project_stubs/quickstart/build.gradle b/tools/android_project_stubs/quickstart/build.gradle
index 03bced9..8d38521 100644
--- a/tools/android_project_stubs/quickstart/build.gradle
+++ b/tools/android_project_stubs/quickstart/build.gradle
@@ -9,9 +9,15 @@
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
+
+        // Use the Android SDK manager, which will automatically download
+        // the required Android SDK.
+        classpath 'com.jakewharton.sdkmanager:gradle-plugin:0.12.0'
     }
 }
 
+apply plugin: 'android-sdk-manager'
+
 allprojects {
     repositories {
         jcenter()