cherrypick 76bd108d from master. do not merge.

Change-Id: Ibb677f286b54a9dd593301a0f8b194d3b2dc58d1
SDK: update SDK to API 15
diff --git a/sdk/doc_source.properties b/sdk/doc_source.properties
index acf5d3b..5b3dce6 100644
--- a/sdk/doc_source.properties
+++ b/sdk/doc_source.properties
@@ -1,5 +1,5 @@
 Pkg.UserSrc=false
 Pkg.Revision=1
-AndroidVersion.ApiLevel=14
+AndroidVersion.ApiLevel=15
 #AndroidVersion.CodeName=