Adds window resizing

components/mus/example/BUILD.gn

Index: components/mus/example/BUILD.gn
diff --git a/components/mus/example/BUILD.gn b/components/mus/example/BUILD.gn
index 711f344e2f1089eb6486500ba1ed0716a940445a..8a9d772b64c2fdca3f97036fd61521cb653f80da 100644
--- a/components/mus/example/BUILD.gn
+++ b/components/mus/example/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
+
 group("example") {
   testonly = true
 
@@ -13,3 +15,13 @@ group("example") {
     "//components/mus/example/wm",
   ]
 }
+
+test("mustash_unittests") {
+  deps = [
+    "//base",
+    "//base/test:run_all_unittests",
+    "//base/test:test_config",
+    "//base/test:test_support",
+    "//components/mus/example/wm:unittests",
+  ]
+}