mojo events: Add |screen_location| to LocationData.

mojo/examples/sample_app/sample_app.cc

Index: mojo/examples/sample_app/sample_app.cc
diff --git a/mojo/examples/sample_app/sample_app.cc b/mojo/examples/sample_app/sample_app.cc
index 222205a3baa76a25b4904612ad3e8fa5f1b9526c..ceebd61b88b5fa4541066af6cfd167bc03c53e89 100644
--- a/mojo/examples/sample_app/sample_app.cc
+++ b/mojo/examples/sample_app/sample_app.cc
@@ -63,7 +63,7 @@ class SampleApp : public mojo::ApplicationDelegate,
   virtual void OnEvent(mojo::EventPtr event,
                        const mojo::Callback<void()>& callback) MOJO_OVERRIDE {
     assert(event);
-    if (event->location)
+    if (event->location_data && event->location_data->in_view_location)
       gles2_client_->HandleInputEvent(*event);
     callback.Run();
   }