Add GestureBuilder to the samples.
diff --git a/build/sdk.atree b/build/sdk.atree
index fe2a17f..a5dc1fe 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -63,6 +63,7 @@
 development/tools/scripts/android.el tools/lib/android.el
 
 # samples
+development/apps/GestureBuilder platforms/${PLATFORM_NAME}/samples/GestureBuilder
 development/samples/HelloActivity platforms/${PLATFORM_NAME}/samples/HelloActivity
 development/samples/Home platforms/${PLATFORM_NAME}/samples/Home
 development/samples/LunarLander platforms/${PLATFORM_NAME}/samples/LunarLander