Support isWeb Operating System context for theia

[mohitsuman]

Feature Description:

Currently theia supports OS context for isWin/Mac/Linux . VSCode context API has added isWeb context too which should be supported in Theia API.

[mohitsuman]

cc : @azatsarynnyy @ericwill

[azatsarynnyy]

Thanks for the feature request @mohitsuman!

BTW, it should be as easy as just adding

this.contextKeyService.createKey<boolean>('isWeb', !this.isElectron());

to

theia/packages/core/src/browser/common-frontend-contribution.ts

Lines 342 to 344 in 4739e26

	this.contextKeyService.createKey<boolean>('isLinux', OS.type() === OS.Type.Linux);
	this.contextKeyService.createKey<boolean>('isMac', OS.type() === OS.Type.OSX);
	this.contextKeyService.createKey<boolean>('isWindows', OS.type() === OS.Type.Windows);

[azatsarynnyy]

Another solution can be env.UIKind API.
It returns UIKind.Desktop or UIKind.Web