GN support for //jingle directory

jingle/jingle.gyp

Index: jingle/jingle.gyp
diff --git a/jingle/jingle.gyp b/jingle/jingle.gyp
index d7a64fa3b749fb4f7558bf82d8017ab68627f653..ed0439c1ed7756d68d77af561097010db56aa484 100644
--- a/jingle/jingle.gyp
+++ b/jingle/jingle.gyp
@@ -13,6 +13,7 @@
     ['enable_webrtc==1 or OS!="android"', {
       'targets': [
         # A library of various utils for integration with libjingle.
+        # GN version: //jingle:jingle_glue
         {
           'target_name': 'jingle_glue',
           'type': 'static_library',
@@ -33,6 +34,8 @@
         #
         # TODO(akalin): Separate out the XMPP stuff from this library into
         # its own library.
+        #
+        # GN version: //jingle:notifier
         {
           'target_name': 'notifier',
           'type': 'static_library',
@@ -100,6 +103,7 @@
             '../third_party/libjingle/libjingle.gyp:libjingle',
           ],
         },
+        # GN version: //jingle:notifier_test_util
         {
           'target_name': 'notifier_test_util',
           'type': 'static_library',
@@ -117,6 +121,7 @@
             '../testing/gmock.gyp:gmock',
           ],
         },
+        # GN version: //jingle:jingle_unittests
         {
           'target_name': 'jingle_unittests',
           'type': 'executable',
@@ -186,6 +191,7 @@
           'target_name': 'jingle_glue_test_util',
           'type': 'none',
         },
+        # GN version: //jingle:notifier
         {
           'target_name': 'notifier',
           'type': 'static_library',