Move the webviewResourceRoot property to be set on each webview instead of as a global property

For #72155

This allows  us to potentially change the resource root per webview

src/vs/workbench/api/browser/mainThreadCodeInsets.ts

@@ -12,6 +12,7 @@ import { IWebviewService, Webview } from 'vs/workbench/contrib/webview/common/we
 import { DisposableStore } from 'vs/base/common/lifecycle';
 import { IActiveCodeEditor, IViewZone } from 'vs/editor/browser/editorBrowser';
 import { ExtensionIdentifier } from 'vs/platform/extensions/common/extensions';
+import { IEnvironmentService } from 'vs/platform/environment/common/environment';
 
 // todo@joh move these things back into something like contrib/insets
 class EditorWebviewZone implements IViewZone {
@@ -59,6 +60,7 @@ export class MainThreadEditorInsets implements MainThreadEditorInsetsShape {
 
 	constructor(
 		context: IExtHostContext,
+		@IEnvironmentService private readonly _environmentService: IEnvironmentService,
 		@ICodeEditorService private readonly _editorService: ICodeEditorService,
 		@IWebviewService private readonly _webviewService: IWebviewService,
 	) {
@@ -144,4 +146,8 @@ export class MainThreadEditorInsets implements MainThreadEditorInsetsShape {
 		}
 		return Promise.resolve(false);
 	}
+
+	async $getResourceRoot(_handle: number): Promise<string> {
+		return this._environmentService.webviewResourceRoot;
+	}
 }

src/vs/workbench/api/browser/mainThreadWebview.ts

@@ -23,6 +23,7 @@ import { ACTIVE_GROUP, IEditorService } from 'vs/workbench/services/editor/commo
 import { IExtensionService } from 'vs/workbench/services/extensions/common/extensions';
 import { extHostNamedCustomer } from '../common/extHostCustomers';
 import { IProductService } from 'vs/platform/product/common/product';
+import { IEnvironmentService } from 'vs/platform/environment/common/environment';
 
 @extHostNamedCustomer(MainContext.MainThreadWebviews)
 export class MainThreadWebviews extends Disposable implements MainThreadWebviewsShape {
@@ -54,6 +55,7 @@ export class MainThreadWebviews extends Disposable implements MainThreadWebviews
 		@IOpenerService private readonly _openerService: IOpenerService,
 		@ITelemetryService private readonly _telemetryService: ITelemetryService,
 		@IProductService private readonly _productService: IProductService,
+		@IEnvironmentService private readonly _environmentService: IEnvironmentService,
 	) {
 		super();
 
@@ -139,6 +141,10 @@ export class MainThreadWebviews extends Disposable implements MainThreadWebviews
 		webview.setOptions(reviveWebviewOptions(options as any /*todo@mat */));
 	}
 
+	async $getResourceRoot(_handle: WebviewPanelHandle): Promise<string> {
+		return this._environmentService.webviewResourceRoot;
+	}
+
 	public $reveal(handle: WebviewPanelHandle, showOptions: WebviewPanelShowOptions): void {
 		const webview = this.getWebview(handle);
 		if (webview.isDisposed()) {

src/vs/workbench/api/common/extHost.protocol.ts

@@ -59,7 +59,6 @@ export interface IEnvironment {
 	extensionTestsLocationURI?: URI;
 	globalStorageHome: URI;
 	userHome: URI;
-	webviewResourceRoot: string;
 }
 
 export interface IStaticWorkspaceData {
@@ -519,6 +518,7 @@ export interface MainThreadEditorInsetsShape extends IDisposable {
 	$setHtml(handle: number, value: string): void;
 	$setOptions(handle: number, options: modes.IWebviewOptions): void;
 	$postMessage(handle: number, value: any): Promise<boolean>;
+	$getResourceRoot(handle: number): Promise<string>;
 }
 
 export interface ExtHostEditorInsetsShape {
@@ -543,6 +543,7 @@ export interface MainThreadWebviewsShape extends IDisposable {
 	$setHtml(handle: WebviewPanelHandle, value: string): void;
 	$setOptions(handle: WebviewPanelHandle, options: modes.IWebviewOptions): void;
 	$postMessage(handle: WebviewPanelHandle, value: any): Promise<boolean>;
+	$getResourceRoot(handle: WebviewPanelHandle): Promise<string>;
 
 	$registerSerializer(viewType: string): void;
 	$unregisterSerializer(viewType: string): void;

src/vs/workbench/api/common/extHostCodeInsets.ts

@@ -61,6 +61,10 @@ export class ExtHostEditorInsets implements ExtHostEditorInsetsShape {
 			private _html: string = '';
 			private _options: vscode.WebviewOptions;
 
+			get resourceRoot(): Promise<string> {
+				return that._proxy.$getResourceRoot(handle);
+			}
+
 			set options(value: vscode.WebviewOptions) {
 				this._options = value;
 				that._proxy.$setOptions(handle, value);

src/vs/workbench/api/common/extHostWebview.ts

@@ -39,6 +39,10 @@ export class ExtHostWebview implements vscode.Webview {
 		this._onMessageEmitter.dispose();
 	}
 
+	public get resourceRoot(): Promise<string> {
+		return this._proxy.$getResourceRoot(this._handle);
+	}
+
 	public get html(): string {
 		this.assertNotDisposed();
 		return this._html;

src/vs/workbench/api/node/extHost.api.impl.ts

@@ -262,10 +262,6 @@ export function createApiFactory(
 			openExternal(uri: URI) {
 				return extHostWindow.openUri(uri, { allowTunneling: !!initData.remote.isRemote });
 			},
-			get webviewResourceRoot() {
-				checkProposedApiEnabled(extension);
-				return initData.environment.webviewResourceRoot;
-			},
 			get remoteName() {
 				if (!initData.remote.authority) {
 					return undefined;