Hook embedded shell up to MojoShellConnection

mojo/shell/runner/host/BUILD.gn

Index: mojo/shell/runner/host/BUILD.gn
diff --git a/mojo/shell/runner/host/BUILD.gn b/mojo/shell/runner/host/BUILD.gn
index b4e38f7179d96391d501d66203eba9c55fd798d4..911ee1179a26b77968d52b3f7804a05598e1b904 100644
--- a/mojo/shell/runner/host/BUILD.gn
+++ b/mojo/shell/runner/host/BUILD.gn
@@ -15,6 +15,10 @@ group("host") {
   ]
 }
 
+config("native_application_support_with_gles2") {
+  defines = [ "NATIVE_APPLICATION_USE_GLES2_IMPL" ]
+}
+
 source_set("native_application_support") {
   sources = [
     "native_application_support.cc",
@@ -23,11 +27,15 @@ source_set("native_application_support") {
 
   deps = [
     "//base",
-    "//mojo/gles2",
     "//mojo/platform_handle:platform_handle_impl",
     "//mojo/shell",
   ]
 
+  if (!is_mac) {
+    configs += [ ":native_application_support_with_gles2" ]
+    deps += [ "//mojo/gles2" ]
+  }
+
   # This target has to include the public thunk headers, which generally
   # shouldn't be included without picking an implementation. We are providing
   # the implementation but the thunk header target cannot declare that we are