We'd like to explore relaxing the permissions checks on the async clipboard API (
implementation) such that no permissions checks would be required if the API is invoked within certain event handlers. For example, when called inside a "paste" event handler, `navigator.clipboard.read()` would not trigger a permission prompt. This should only happen if the EditorCommandSource is kMenuOrBinding. Currently we're only at the stage of assessing technical feasibility and will save the full launch review process for later, so ignoring any security or privacy concerns for the moment...