Add first wearable sample to sdk atree

Bug: 15591212

Change-Id: Ic74e8e821d7941d403dc4d83aa33f23cf671c226
diff --git a/build/sdk.atree b/build/sdk.atree
index d1000f3..5aa7f7d 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -269,6 +269,9 @@
 developers/build/prebuilts/gradle/SwipeRefreshMultipleViews                  samples/${PLATFORM_NAME}/ui/SwipeRefreshMultipleViews
 developers/build/prebuilts/gradle/MediaRouter                                samples/${PLATFORM_NAME}/media/MediaRouter
 
+# Wearable sample tree
+development/samples/wearable/Notifications     samples/${PLATFORM_NAME}/wearable/Notifications
+
 # Old sample tree
 development/samples/AccelerometerPlay          samples/${PLATFORM_NAME}/legacy/AccelerometerPlay
 development/samples/ActionBarCompat            samples/${PLATFORM_NAME}/legacy/ActionBarCompat