refactor(devtools): prepare codebase for migration to angular/angular repo

devtools/src/demo-application-operations.ts

@@ -0,0 +1,17 @@
+import { ApplicationOperations } from 'ng-devtools';
+import { DirectivePosition, ElementPosition } from 'protocol';
+
+export class DemoApplicationOperations extends ApplicationOperations {
+  viewSource(position: ElementPosition): void {
+    console.warn('viewSource() is not implemented because the demo app runs in an Iframe');
+    throw new Error('Not implemented in demo app.');
+  }
+  selectDomElement(position: ElementPosition): void {
+    console.warn('selectDomElement() is not implemented because the demo app runs in an Iframe');
+    throw new Error('Not implemented in demo app.');
+  }
+  inspect(directivePosition: DirectivePosition, keyPath: string[]): void {
+    console.warn('inspect() is not implemented because the demo app runs in an Iframe');
+    return;
+  }
+}