Add proxy mapper hook.
diff --git a/package.xml b/package.xml
index aa1894f..fce06ce 100644
--- a/package.xml
+++ b/package.xml
@@ -331,6 +331,8 @@
     <file baseinstalldir="/" name="src/core/ext/client_channel/lb_policy_factory.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/lb_policy_registry.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/parse_address.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/client_channel/proxy_mapper.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/client_channel/proxy_mapper_registry.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver_factory.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver_registry.h" role="src" />
@@ -537,6 +539,8 @@
     <file baseinstalldir="/" name="src/core/ext/client_channel/lb_policy_factory.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/lb_policy_registry.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/parse_address.c" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/client_channel/proxy_mapper.c" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/client_channel/proxy_mapper_registry.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver_factory.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/client_channel/resolver_registry.c" role="src" />