Closure Library v20190513

New Additions

• goog.ui.PopupMenu now can be overridden with the browser context menu via setShiftOverride

Backwards Incompatible Changes

• Fix goog.base not working in ES5 classes that have ES6 subclasses. This is not IE8 compatible and other pre-ES5 javascript environments.
• Add divideAndRemainder and abs to goog.math.Integer.

Other Changes

• Initialize goog.global correctly when running as an ES module
• Bugfix that allows compiler to optimize out closure deps
• Add an additional clarifying comment to goog.global in ES modules
• Print message error in addition to stacktrace in globalError handler in jsunit tests.
• Add the ability to enable js error reporting for uncaught errors in native promise and async/await functions. For native promises, install a protected entrypoint function around Promise.prototype.then. For async/await, listen to unhandledrejection events on browsers that support it.
• In the unhandledrejection event handler, avoid dereferencing the window object since it's unneeded and protect against the case where the unhandledrejection event/event.reason is undefined.
• Ensure that the closure compiler views calls to goog.require('goog.math.Integer') as side-effect free.