Update WindowTree::OnWindowInputEventAck to include handled

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 55e264e2f586beeaacb749fe5848df05d7faf7ad..1070e26773baa849ded752109e1df6d6c9e07c90 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -765,10 +765,13 @@ test("content_unittests") {
 
   if (use_aura) {
     deps += [
+      "//content/public/renderer:renderer_sources",
+      "//content/renderer/mus:mus",
       "//ui/aura",
       "//ui/aura_extra",
       "//ui/wm",
     ]
+    sources += [ "../renderer/mus/compositor_mus_connection_unittest.cc" ]
   } else {
     sources -= [
       "../browser/renderer_host/render_widget_host_view_aura_unittest.cc",