Put more files under the enable_service_discovery build flag.

chrome/common/extensions/api/schemas.gypi

Index: chrome/common/extensions/api/schemas.gypi
diff --git a/chrome/common/extensions/api/schemas.gypi b/chrome/common/extensions/api/schemas.gypi
index 18fcc9e50df41ce4e8879aff4319a634d69a6f73..12d59d5230d532d02653cf0674aa6a8b5f6e9651 100644
--- a/chrome/common/extensions/api/schemas.gypi
+++ b/chrome/common/extensions/api/schemas.gypi
@@ -136,6 +136,11 @@
       'media_player_private.json',
     ],
 
+    'service_discovery_schema_files': [
+      'gcd_private.idl',
+      'mdns.idl',
+    ],
+
     'webrtc_schema_files': [
       'cast_streaming_receiver_session.idl',
       'cast_streaming_rtp_stream.idl',
@@ -173,6 +178,11 @@
 	  'input_ime.json',
 	],
       }],
+      ['enable_service_discovery==1', {
+        'schema_files': [
+          '<@(service_discovery_schema_files)',
+        ],
+      }],
       ['enable_webrtc==1', {
         'schema_files': [
           '<@(webrtc_schema_files)',