Run Mus Demo and WS tests on Ozone Linux bot

testing/buildbot/chromium.fyi.json

 {
   "Android Asan Builder Tests (dbg)": {
     "gtest_tests": [
       {
         "args": [
           "--tool=asan"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
         },
@@ skipping 10235 matching lines @@
         },
         "test": "sandbox_linux_unittests"
       }
     ]
   },
   "Linux Clang Analyzer": {
     "additional_compile_targets": [
       "all"
     ]
   },
+  "Linux Ozone": {
+    "additional_compile_targets": [

[kylechar, 2017/03/14 13:16:46]

The test targets listed in gtest_tests get compiled, so this section shouldn't
be necessary.

[fwang, 2017/03/14 13:25:07]

OK, thanks. I was wondering that too :-)

[fwang, 2017/03/14 13:41:55]

Done.

+      "mus_demo_unittests",
+      "mus_ws_unittests"
+    ],
+    "gtest_tests": [
+      {
+        "args": [
+          "--ozone-platform=headless"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "mus_demo_unittests"
+      },
+      {
+        "args": [
+          "--ozone-platform=headless"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "mus_ws_unittests"
+      }
+    ]
+  },
   "Linux Trusty": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
         "swarming": {
@@ skipping 2484 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": false
         },
         "test": "views_unittests"
       }
     ]
   }
 }