Merge from vscode 4d91d96e5e121b38d33508cdef17868bab255eae

src/vs/workbench/electron-sandbox/desktop.contribution.ts

@@ -356,6 +356,13 @@ import { InstallVSIXAction } from 'vs/workbench/contrib/extensions/browser/exten
 			'force-color-profile': {
 				type: 'string',
 				markdownDescription: nls.localize('argv.forceColorProfile', 'Allows to override the color profile to use. If you experience colors appear badly, try to set this to `srgb` and restart.')
+			},
+			'enable-proposed-api': {
+				type: 'array',
+				description: nls.localize('argv.enebleProposedApi', "Enable proposed APIs for a list of extension ids (such as \`vscode.git\`). Proposed APIs are unstable and subject to breaking without warning at any time. This should only be set for extension development and testing purposes."),
+				items: {
+					type: 'string'
+				}
 			}
 		}
 	};