Add test specs for a new experimental MSan tester.

testing/buildbot/chromium.fyi.json

 {
   "Linux Trusty": {
     "gtest_tests": [
       "app_list_unittests",
       "aura_unittests",
       "interactive_ui_tests",
       "base_unittests",
       "cacheinvalidation_unittests",
       "cast_unittests",
       "cc_unittests",
@@ skipping 194 matching lines @@
   },
   "Linux ARM Cross-Compile": {
     "compile_targets": [
       "browser_tests_run"
     ],
     "gtest_tests": [
       "browser_tests"
     ]
   },
   "Chromium Linux MSan": {
+    "compile_targets": [

[Paweł Hajdan Jr., 2014/06/04 10:36:28]

Actually looking at https://codereview.chromium.org/307353005/ this is not
needed. In the chromium recipes the builders automatically compile targets
needed for dependent testers.

[earthdok, 2014/06/04 12:38:04]

Done.

+      "browser_tests"
+    ],
     "gtest_tests": [
       "base_unittests",
       "cacheinvalidation_unittests",
       "cc_unittests",
       "content_browsertests",
       "content_unittests",
       "crypto_unittests",
       "device_unittests",
       "gpu_unittests",
+      "interactive_ui_tests",
       "ipc_tests",
       "jingle_unittests",
       "media_unittests",
       "net_unittests",
       "ppapi_unittests",
       "printing_unittests",
       "remoting_unittests",
       "sandbox_linux_unittests",
       "sql_unittests",
       "sync_unit_tests",
       "ui_unittests",
       "unit_tests",
       "url_unittests"
     ]
+  },
+  "Chromium Linux MSan (browser tests)": {
+    "gtest_tests": [
+      "browser_tests"
+    ]
   }
 }