Added a locality map class that maintains a child policy per locality. This is used by the xds lb policy to manage multiple localities. Also added a grpc_core::Map which is a templatized map, that is used by the locality map to maintain this info
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 8e544b0..4e4f812 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -208,8 +208,10 @@
'src/core/lib/gprpp/atomic.h',
'src/core/lib/gprpp/fork.h',
'src/core/lib/gprpp/manual_constructor.h',
+ 'src/core/lib/gprpp/map.h',
'src/core/lib/gprpp/memory.h',
'src/core/lib/gprpp/mutex_lock.h',
+ 'src/core/lib/gprpp/pair.h',
'src/core/lib/gprpp/thd.h',
'src/core/lib/profiling/timers.h',
'src/core/lib/gpr/alloc.cc',
@@ -877,8 +879,10 @@
'src/core/lib/gprpp/atomic.h',
'src/core/lib/gprpp/fork.h',
'src/core/lib/gprpp/manual_constructor.h',
+ 'src/core/lib/gprpp/map.h',
'src/core/lib/gprpp/memory.h',
'src/core/lib/gprpp/mutex_lock.h',
+ 'src/core/lib/gprpp/pair.h',
'src/core/lib/gprpp/thd.h',
'src/core/lib/profiling/timers.h',
'src/core/ext/transport/chttp2/transport/bin_decoder.h',
