mustash: Implement basic input event routing in renderer

content/renderer/BUILD.gn

Index: content/renderer/BUILD.gn
diff --git a/content/renderer/BUILD.gn b/content/renderer/BUILD.gn
index bf1d4deb5ec7190a6acc04fae67567e95da797a4..8275f4e3b86af0c2f3fe4dc606926d427c8e51ba 100644
--- a/content/renderer/BUILD.gn
+++ b/content/renderer/BUILD.gn
@@ -78,11 +78,15 @@ source_set("renderer") {
 
   if (use_aura) {
     sources += [
+      "compositor_mus_connection.cc",
+      "compositor_mus_connection.h",
       "render_widget_mus_connection.cc",
       "render_widget_mus_connection.h",
       "render_widget_window_tree_client_factory.cc",
       "render_widget_window_tree_client_factory.h",
     ]
+
+    deps += [ "//mojo/converters/blink" ]
   }
 
   if (is_mac) {