Do not set the mouse event handler if Widget::SetCapture() fails

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index d8b203080719216c6279f60c9e4d4af43f88eefe..82a2f538909cf6b12c5b6a249a17a4bb25d2c579 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -938,11 +938,17 @@ NativeWidget* Widget::native_widget() {
 }
 
 void Widget::SetCapture(View* view) {
+  if (!native_widget_->HasCapture()) {
+    native_widget_->SetCapture();
+
+    // Early return if setting capture was unsuccessful.
+    if (!native_widget_->HasCapture())
+      return;
+  }
+
   if (internal::NativeWidgetPrivate::IsMouseButtonDown())
     is_mouse_button_pressed_ = true;
   root_view_->SetMouseHandler(view);
-  if (!native_widget_->HasCapture())
-    native_widget_->SetCapture();
 }
 
 void Widget::ReleaseCapture() {