chat - add serverlessWebEnabled for testing web support

Author: bpasero

src/vs/workbench/contrib/chat/common/chatContextKeys.ts

@@ -33,7 +33,7 @@ export namespace ChatContextKeys {
 	export const hasPromptFile = new RawContextKey<boolean>('chatPromptFileAttached', false, { type: 'boolean', description: localize('chatPromptFileAttachedContextDescription', "True when the chat has a prompt file attached.") });
 	export const chatMode = new RawContextKey<ChatMode>('chatMode', ChatMode.Ask, { type: 'string', description: localize('chatMode', "The current chat mode.") });
 
-	export const supported = ContextKeyExpr.or(IsWebContext.negate(), RemoteNameContext.notEqualsTo('')); // supported on desktop and in web only with a remote connection
+	export const supported = ContextKeyExpr.or(IsWebContext.negate(), RemoteNameContext.notEqualsTo(''), ContextKeyExpr.has('config.chat.experimental.serverlessWebEnabled'));
 	export const enabled = new RawContextKey<boolean>('chatIsEnabled', false, { type: 'boolean', description: localize('chatIsEnabled', "True when chat is enabled because a default chat participant is activated with an implementation.") });
 
 	export const extensionParticipantRegistered = new RawContextKey<boolean>('chatPanelExtensionParticipantRegistered', false, { type: 'boolean', description: localize('chatPanelExtensionParticipantRegistered', "True when a default chat participant is registered for the panel from an extension.") });

src/vs/workbench/contrib/chat/common/chatEntitlementService.ts

@@ -147,6 +147,7 @@ export class ChatEntitlementService extends Disposable implements IChatEntitleme
 		@IProductService productService: IProductService,
 		@IWorkbenchEnvironmentService environmentService: IWorkbenchEnvironmentService,
 		@IContextKeyService private readonly contextKeyService: IContextKeyService,
+		@IConfigurationService configurationService: IConfigurationService
 	) {
 		super();
 
@@ -179,7 +180,12 @@ export class ChatEntitlementService extends Disposable implements IChatEntitleme
 
 		if (
 			!productService.defaultChatAgent ||				// needs product config
-			(isWeb && !environmentService.remoteAuthority)	// only enabled locally or a remote backend
+			(
+				// TODO@bpasero remove this condition and 'serverlessWebEnabled' once Chat web support lands
+				isWeb &&
+				!environmentService.remoteAuthority &&
+				!configurationService.getValue('chat.experimental.serverlessWebEnabled')
+			)
 		) {
 			ChatContextKeys.Setup.hidden.bindTo(this.contextKeyService).set(true); // hide copilot UI
 			return;