Get mus_ws_unittests working with Ozone X11.

WindowServerTests need a TYPE_UI message loop to work with libevent for
Ozone X11. Luckily, there is already a virtual function in ServiceTest
to create a MessageLoop.

Other Changes:
- Switch mus_ws_unittests to run with Ozone X11
- Add media_service_unittests to CQ trybot instead of FYI trybot.
- Delete tests from FYI trybot that run on CQ trybot.

BUG=664570

Review-Url: https://codereview.chromium.org/2661163006
Cr-Commit-Position: refs/heads/master@{#448049}

services/ui/ws/window_manager_client_unittest.cc

@@ -353,6 +353,12 @@ class WindowServerTest : public WindowServerTestBase {
       EXPECT_TRUE(WindowServerTestBase::QuitRunLoop());
   }
 
+  // mojo::test::ServiceTest::
+  std::unique_ptr<base::MessageLoop> CreateMessageLoop() override {
+    // The window server is expected to run with a TYPE_UI message loop.
+    return base::MakeUnique<base::MessageLoop>(base::MessageLoop::TYPE_UI);
+  }
+
   std::unique_ptr<EmbedDetails> embed_details_;
 
   std::unique_ptr<ClientAreaChange> client_area_change_;

testing/buildbot/chromium.chromiumos.json

@@ -246,6 +246,12 @@
         },
         "test": "media_blink_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": false
+        },
+        "test": "media_service_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
@@ -271,9 +277,6 @@
         "test": "mus_demo_unittests"
       },
       {
-        "args": [
-          "--ozone-platform=headless"
-        ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },

testing/buildbot/chromium.fyi.json

@@ -11368,27 +11368,6 @@
           "can_use_on_swarming_builders": false
         },
         "test": "browser_tests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": false
-        },
-        "test": "media_service_unittests"
-      },
-      {
-        "args": [
-          "--ozone-platform=headless"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": false
-        },
-        "test": "mus_ws_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "views_mus_unittests"
       }
     ]
   },