Manifest for Android CTS 5.1 Release 15 (3619395)

Change-Id: I80fd1807bd937170b34abb67bc51db2a48468801
diff --git a/default.xml b/default.xml
index 1db65ab..f48602a 100644
--- a/default.xml
+++ b/default.xml
@@ -2,7 +2,7 @@
 <manifest>
 
   <remote name="aosp" fetch=".." review="https://android-review.googlesource.com/"/>
-  <default revision="refs/tags/android-cts-5.1_r14" remote="aosp" sync-j="4"/>
+  <default revision="refs/tags/android-cts-5.1_r15" remote="aosp" sync-j="4"/>
 
   <project path="build" name="platform/build" groups="pdk,tradefed">
     <copyfile src="core/root.mk" dest="Makefile"/>