[libclang] Indexing API: Provide the protocols list for objc categories as well.

rdar://10573361

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146498 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/Indexing.cpp b/tools/libclang/Indexing.cpp
index 50c37bc..630c55b 100644
--- a/tools/libclang/Indexing.cpp
+++ b/tools/libclang/Indexing.cpp
@@ -583,6 +583,9 @@
         ProtInfo = dyn_cast<ObjCProtocolDeclInfo>(DI))
     return &ProtInfo->ObjCProtoRefListInfo;
 
+  if (const ObjCCategoryDeclInfo *CatInfo = dyn_cast<ObjCCategoryDeclInfo>(DI))
+    return CatInfo->ObjCCatDeclInfo.protocols;
+
   return 0;
 }