mash: Don't draw the window title under chrome tabs.

mash/wm/non_client_frame_controller.cc

Index: mash/wm/non_client_frame_controller.cc
diff --git a/mash/wm/non_client_frame_controller.cc b/mash/wm/non_client_frame_controller.cc
index f62cb153bb1f2d20f81b21d7b9adc68c19e420f4..81dc82b7fb1f2fb5756d19473babbf45f649742d 100644
--- a/mash/wm/non_client_frame_controller.cc
+++ b/mash/wm/non_client_frame_controller.cc
@@ -256,6 +256,12 @@ bool NonClientFrameController::CanMinimize() const {
           mus::mojom::kResizeBehaviorCanMinimize) != 0;
 }
 
+bool NonClientFrameController::ShouldShowWindowTitle() const {
+  // Only draw the title if the client hasn't declared any additional client
+  // areas which might conflict with it.
+  return window_ && window_->additional_client_areas().empty();
+}
+
 views::ClientView* NonClientFrameController::CreateClientView(
     views::Widget* widget) {
   return new ClientViewMus(widget, GetContentsView(), this);