diff --git a/modules/@angular/core/src/debug/debug_renderer.ts b/modules/@angular/core/src/debug/debug_renderer.ts
index 5184f74eca..43df05bc29 100644
--- a/modules/@angular/core/src/debug/debug_renderer.ts
+++ b/modules/@angular/core/src/debug/debug_renderer.ts
@@ -24,14 +24,14 @@ export class DebugDomRootRenderer implements RootRenderer {
 export class DebugDomRenderer implements Renderer {
   constructor(private _delegate: Renderer) {}
 
-  selectRootElement(selectorOrNode: string | any, debugInfo: RenderDebugInfo): any {
+  selectRootElement(selectorOrNode: string | any, debugInfo?: RenderDebugInfo): any {
     var nativeEl = this._delegate.selectRootElement(selectorOrNode, debugInfo);
     var debugEl = new DebugElement(nativeEl, null, debugInfo);
     indexDebugNode(debugEl);
     return nativeEl;
   }
 
-  createElement(parentElement: any, name: string, debugInfo: RenderDebugInfo): any {
+  createElement(parentElement: any, name: string, debugInfo?: RenderDebugInfo): any {
     var nativeEl = this._delegate.createElement(parentElement, name, debugInfo);
     var debugEl = new DebugElement(nativeEl, getDebugNode(parentElement), debugInfo);
     debugEl.name = name;
@@ -41,14 +41,14 @@ export class DebugDomRenderer implements Renderer {
 
   createViewRoot(hostElement: any): any { return this._delegate.createViewRoot(hostElement); }
 
-  createTemplateAnchor(parentElement: any, debugInfo: RenderDebugInfo): any {
+  createTemplateAnchor(parentElement: any, debugInfo?: RenderDebugInfo): any {
     var comment = this._delegate.createTemplateAnchor(parentElement, debugInfo);
     var debugEl = new DebugNode(comment, getDebugNode(parentElement), debugInfo);
     indexDebugNode(debugEl);
     return comment;
   }
 
-  createText(parentElement: any, value: string, debugInfo: RenderDebugInfo): any {
+  createText(parentElement: any, value: string, debugInfo?: RenderDebugInfo): any {
     var text = this._delegate.createText(parentElement, value, debugInfo);
     var debugEl = new DebugNode(text, getDebugNode(parentElement), debugInfo);
     indexDebugNode(debugEl);
@@ -136,7 +136,7 @@ export class DebugDomRenderer implements Renderer {
     this._delegate.setElementStyle(renderElement, styleName, styleValue);
   }
 
-  invokeElementMethod(renderElement: any, methodName: string, args: any[]) {
+  invokeElementMethod(renderElement: any, methodName: string, args?: any[]) {
     this._delegate.invokeElementMethod(renderElement, methodName, args);
   }
 
diff --git a/modules/@angular/core/src/render/api.ts b/modules/@angular/core/src/render/api.ts
index f52411ca87..8ed2f106c3 100644
--- a/modules/@angular/core/src/render/api.ts
+++ b/modules/@angular/core/src/render/api.ts
@@ -26,15 +26,15 @@ export abstract class RenderDebugInfo {
  * @experimental
  */
 export abstract class Renderer {
-  abstract selectRootElement(selectorOrNode: string | any, debugInfo: RenderDebugInfo): any;
+  abstract selectRootElement(selectorOrNode: string | any, debugInfo?: RenderDebugInfo): any;
 
-  abstract createElement(parentElement: any, name: string, debugInfo: RenderDebugInfo): any;
+  abstract createElement(parentElement: any, name: string, debugInfo?: RenderDebugInfo): any;
 
   abstract createViewRoot(hostElement: any): any;
 
-  abstract createTemplateAnchor(parentElement: any, debugInfo: RenderDebugInfo): any;
+  abstract createTemplateAnchor(parentElement: any, debugInfo?: RenderDebugInfo): any;
 
-  abstract createText(parentElement: any, value: string, debugInfo: RenderDebugInfo): any;
+  abstract createText(parentElement: any, value: string, debugInfo?: RenderDebugInfo): any;
 
   abstract projectNodes(parentElement: any, nodes: any[]): void;
 
@@ -65,7 +65,7 @@ export abstract class Renderer {
 
   abstract setElementStyle(renderElement: any, styleName: string, styleValue: string);
 
-  abstract invokeElementMethod(renderElement: any, methodName: string, args: any[]);
+  abstract invokeElementMethod(renderElement: any, methodName: string, args?: any[]);
 
   abstract setText(renderNode: any, text: string);
 
diff --git a/modules/@angular/platform-browser/src/web_workers/worker/renderer.ts b/modules/@angular/platform-browser/src/web_workers/worker/renderer.ts
index 2fe91dc3fc..36eed29b11 100644
--- a/modules/@angular/platform-browser/src/web_workers/worker/renderer.ts
+++ b/modules/@angular/platform-browser/src/web_workers/worker/renderer.ts
@@ -92,14 +92,14 @@ export class WebWorkerRenderer implements Renderer, RenderStoreObject {
     this._rootRenderer.runOnService(fnName, fnArgsWithRenderer);
   }
 
-  selectRootElement(selectorOrNode: string, debugInfo: RenderDebugInfo): any {
+  selectRootElement(selectorOrNode: string, debugInfo?: RenderDebugInfo): any {
     var node = this._rootRenderer.allocateNode();
     this._runOnService('selectRootElement',
                        [new FnArg(selectorOrNode, null), new FnArg(node, RenderStoreObject)]);
     return node;
   }
 
-  createElement(parentElement: any, name: string, debugInfo: RenderDebugInfo): any {
+  createElement(parentElement: any, name: string, debugInfo?: RenderDebugInfo): any {
     var node = this._rootRenderer.allocateNode();
     this._runOnService('createElement', [
       new FnArg(parentElement, RenderStoreObject),
@@ -119,7 +119,7 @@ export class WebWorkerRenderer implements Renderer, RenderStoreObject {
     return viewRoot;
   }
 
-  createTemplateAnchor(parentElement: any, debugInfo: RenderDebugInfo): any {
+  createTemplateAnchor(parentElement: any, debugInfo?: RenderDebugInfo): any {
     var node = this._rootRenderer.allocateNode();
     this._runOnService(
         'createTemplateAnchor',
@@ -127,7 +127,7 @@ export class WebWorkerRenderer implements Renderer, RenderStoreObject {
     return node;
   }
 
-  createText(parentElement: any, value: string, debugInfo: RenderDebugInfo): any {
+  createText(parentElement: any, value: string, debugInfo?: RenderDebugInfo): any {
     var node = this._rootRenderer.allocateNode();
     this._runOnService('createText', [
       new FnArg(parentElement, RenderStoreObject),
@@ -205,7 +205,7 @@ export class WebWorkerRenderer implements Renderer, RenderStoreObject {
     ]);
   }
 
-  invokeElementMethod(renderElement: any, methodName: string, args: any[]) {
+  invokeElementMethod(renderElement: any, methodName: string, args?: any[]) {
     this._runOnService('invokeElementMethod', [
       new FnArg(renderElement, RenderStoreObject),
       new FnArg(methodName, null),