Add new samples to build.gradle

- content/webview/PermissionRequest
- content/documentsUi/DirectorySelection
- system/AppUsageStatistics
- media/ScreenCapture

Change-Id: Ibbd29b88c0eaa4d3808f7d5ba96e74d9ac90d741
diff --git a/build.gradle b/build.gradle
index 789ffce..082f67d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -92,6 +92,10 @@
 "wearable/wear/Timer",
 "wearable/wear/WatchViewStub",
 "wearable/wear/WatchFace",
+"content/webview/PermissionRequest",
+"content/documentsUi/DirectorySelection",
+"system/AppUsageStatistics",
+"media/ScreenCapture",
 ]
 
 List<String> taskNames = [