Changelog:

• Add support for preload modules (--require) in the default app.
• Add session.enableNetworkEmulation and session.disableNetworkEmulation APIs.
• Move devtools-opened, devtools-closed, devtools-focused events from BrowserWindow to WebContents.
• Move devToolsWebContents property from BrowserWindow to WebContents.
• A few improvements on the sendInputEvent API.
• Requests with unhandled protocols like mailto: are now opened by system's default application.
• Reduce memory usage when calling <webview>'s methods.
• Fix network throttling in devtools not working.
• Fix source map not loading for JavaScript in devtools.
• Fix context menu not working for devtools opened for <webview>.
• Fix the regression of window.outerHeight and window.outerWidth being set to 0 in hidden window.

Windows

• Fix extension not added to filename in file dialogs when custom filter is specified.
• Fix maximize/mnimize events not emitted for AeroSnap.

Linux

• Improve how we detect whether Unity is running.