Changes around how browser_tests are launched for mash

mash/package/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("package") {
+  sources = [
+    "mash_packaged_service.cc",
+    "mash_packaged_service.h",
+  ]
+
+  deps = [
+    "//ash/mus:lib",
+    "//ash/touch_hud/mus:lib",
+    "//mash/app_driver:lib",
+    "//mash/public/interfaces",
+    "//mash/quick_launch:lib",
+    "//mash/session:lib",
+    "//mash/task_viewer:lib",
+    "//services/shell/public/cpp",
+    "//services/shell/public/interfaces",
+    "//services/ui:lib",
+  ]
+
+  if (is_linux && !is_android) {
+    deps += [ "//components/font_service:lib" ]
+  }
+}