check-webkit-style rejected at the following code: if (!visible) { { DebugScopedSetImplThread impl; m_layerTreeHost->didBecomeInvisibleOnImplThread(m_layerTreeHostImpl.get()); } ... other code that must execute when !visible, but when impl is out of scope ... The style check failed because the second curly brace wasn't on the previous line, but I think that it should be fine where it is.