Reland of move {media,p2p,pc,xmllite,xmpp}_tests.gypi files.

webrtc/libjingle/xmpp/xmpp.gyp

Index: webrtc/libjingle/xmpp/xmpp.gyp
diff --git a/webrtc/libjingle/xmpp/xmpp.gyp b/webrtc/libjingle/xmpp/xmpp.gyp
index 6b738e7f3cfbd9aa7564bc7a77df95767ab939e1..4dc75f7b52e89df4841c383dd128fd5edb321338 100644
--- a/webrtc/libjingle/xmpp/xmpp.gyp
+++ b/webrtc/libjingle/xmpp/xmpp.gyp
@@ -140,6 +140,36 @@
           ],
         }],
       ],
-    }],
+    },
+  ],  # targets
+  'conditions': [
+    ['include_tests==1', {
+      'targets' : [
+        {
+          'target_name': 'rtc_xmpp_unittest',
+          'type': 'none',
+          'direct_dependent_settings': {
+            'sources': [
+              'fakexmppclient.h',
+              'hangoutpubsubclient_unittest.cc',
+              'jid_unittest.cc',
+              'mucroomconfigtask_unittest.cc',
+              'mucroomdiscoverytask_unittest.cc',
+              'mucroomlookuptask_unittest.cc',
+              'mucroomuniquehangoutidtask_unittest.cc',
+              'pingtask_unittest.cc',
+              'pubsubclient_unittest.cc',
+              'pubsubtasks_unittest.cc',
+              'util_unittest.cc',
+              'util_unittest.h',
+              'xmppengine_unittest.cc',
+              'xmpplogintask_unittest.cc',
+              'xmppstanzaparser_unittest.cc',
+            ],
+          },
+        },  # target rtc_xmpp_unittest
+      ],  # targets
+    }],  # include_tests==1
+  ],  # conditions
 }