Rename WindowTreeHost functions to indicate pixels/dips.

ui/views/mus/mus_client.cc

Index: ui/views/mus/mus_client.cc
diff --git a/ui/views/mus/mus_client.cc b/ui/views/mus/mus_client.cc
index 4baf674a5b90477469b9ccf36be77d5bd488bc12..f340aef5353282e04ce9e11eebdb84bc7ef28604 100644
--- a/ui/views/mus/mus_client.cc
+++ b/ui/views/mus/mus_client.cc
@@ -202,7 +202,7 @@ aura::Window* MusClient::GetWindowAtScreenPoint(const gfx::Point& point) {
       continue;
     // TODO: this likely gets z-order wrong. http://crbug.com/663606.
     gfx::Point relative_point(point);
-    window_tree_host->ConvertPointFromNativeScreen(&relative_point);
+    window_tree_host->ConvertPointFromNativeScreenToDIP(&relative_point);
     if (gfx::Rect(root->bounds().size()).Contains(relative_point))
       return root->GetTopWindowContainingPoint(relative_point);
   }