Use standard 'postMessage' name

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

@@ -101,7 +101,7 @@ export class MainThreadWebviews implements MainThreadWebviewsShape, WebviewReviv
 		this._webviewService.revealWebview(webview, column);
 	}
 
-	async $sendMessage(handle: WebviewPanelHandle, message: any): TPromise<boolean> {
+	async $postMessage(handle: WebviewPanelHandle, message: any): TPromise<boolean> {
 		const webview = this.getWebview(handle);
 		const editors = this._editorService.getVisibleEditors()
 			.filter(e => e instanceof WebviewEditor)

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

@@ -355,7 +355,7 @@ export interface MainThreadWebviewsShape extends IDisposable {
 	$reveal(handle: WebviewPanelHandle, column: EditorPosition): void;
 	$setTitle(handle: WebviewPanelHandle, value: string): void;
 	$setHtml(handle: WebviewPanelHandle, value: string): void;
-	$sendMessage(handle: WebviewPanelHandle, value: any): Thenable<boolean>;
+	$postMessage(handle: WebviewPanelHandle, value: any): Thenable<boolean>;
 
 	$registerSerializer(viewType: string): void;
 	$unregisterSerializer(viewType: string): void;

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

@@ -74,7 +74,7 @@ export class ExtHostWebview implements vscode.Webview {
 
 	public postMessage(message: any): Thenable<boolean> {
 		this.assertNotDisposed();
-		return this._proxy.$sendMessage(this._handle, message);
+		return this._proxy.$postMessage(this._handle, message);
 	}
 
 	public reveal(viewColumn: vscode.ViewColumn): void {
@@ -173,7 +173,7 @@ export class ExtHostWebviewPanel implements vscode.WebviewPanel {
 
 	public postMessage(message: any): Thenable<boolean> {
 		this.assertNotDisposed();
-		return this._proxy.$sendMessage(this._handle, message);
+		return this._proxy.$postMessage(this._handle, message);
 	}
 
 	public reveal(viewColumn: vscode.ViewColumn): void {