Add mus::mojom::ChannelHandle for passing IPC::ChannelHandle via mojo IPC.

testing/buildbot/gn_isolate_map.pyl

Index: testing/buildbot/gn_isolate_map.pyl
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index 89c7236ae337ff417cddd50e4eeb656fd8698f4d..77838047ce67db2b8d0e711dd321fcbc4e77ff06 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -409,6 +409,10 @@
     "label": "//mash:mash_unittests",
     "type": "unknown",
   },
+  "mus_gpu_unittests": {
+    "label": "//components/mus/gpu:mus_gpu_unittests",
+    "type": "console_test_launcher",

[sky, 2016/04/27 21:11:21]

gpu tests are really console based? I would have thought they need a screen.

[Peng, 2016/04/27 22:09:40]

Right now, it only has one test for a ChannelHandle type converter. So it can be
console based now. But it could be changed later when new tests are added.

+  },
   "mus_ws_unittests": {
     "label": "//components/mus/ws:mus_ws_unittests",
     "type": "windowed_test_launcher",