feat(cdk/testing): update cdk/testing public API

Update API golden files for ProtractorElement and UnitTestElement.

Author: wwjhu

tools/public_api_guard/cdk/testing/protractor.d.ts

@@ -3,7 +3,11 @@ export declare class ProtractorElement implements TestElement {
     constructor(element: ElementFinder);
     blur(): Promise<void>;
     clear(): Promise<void>;
-    click(...args: [] | ['center'] | [number, number]): Promise<void>;
+    click(...args: [ModifierKeys?] | ['center', ModifierKeys?] | [
+        number,
+        number,
+        ModifierKeys?
+    ]): Promise<void>;
     dispatchEvent(name: string, data?: Record<string, EventData>): Promise<void>;
     focus(): Promise<void>;
     getAttribute(name: string): Promise<string | null>;

tools/public_api_guard/cdk/testing/testbed.d.ts

@@ -21,7 +21,11 @@ export declare class UnitTestElement implements TestElement {
     constructor(element: Element, _stabilize: () => Promise<void>);
     blur(): Promise<void>;
     clear(): Promise<void>;
-    click(...args: [] | ['center'] | [number, number]): Promise<void>;
+    click(...args: [ModifierKeys?] | ['center', ModifierKeys?] | [
+        number,
+        number,
+        ModifierKeys?
+    ]): Promise<void>;
     dispatchEvent(name: string, data?: Record<string, EventData>): Promise<void>;
     focus(): Promise<void>;
     getAttribute(name: string): Promise<string | null>;