Add MB and iOS JSON entries for ortc_unittests.

BUG=webrtc:7013
TBR=ehmaldonado@webrtc.org
NOTRY=True

Review-Url: https://codereview.webrtc.org/2706403007
Cr-Commit-Position: refs/heads/master@{#16816}

tools-webrtc/ios/tests/common_tests.json

@@ -16,6 +16,9 @@
     {
       "app": "modules_tests"
     },
+    {
+      "app": "ortc_unittests"
+    },
     {
       "app": "rtc_pc_unittests"
     },

tools-webrtc/mb/gn_isolate_map.pyl

@@ -51,6 +51,10 @@
     "label": "//webrtc/modules:modules_unittests",
     "type": "windowed_test_launcher",
   },
+  "ortc_unittests": {
+    "label": "//webrtc/ortc:ortc_unittests",
+    "type": "console_test_launcher",
+  },
   "peerconnection_unittests": {
     "label": "//webrtc/pc:peerconnection_unittests",
     "type": "console_test_launcher",