fix(upgrade): fix downgrade content projection and injector inheritance

- Full support for content projection in downgraded Angular 2
  components. In particular, this enables multi-slot projection and
  other features on <ng-content>.
- Correctly wire up hierarchical injectors for downgraded Angular 2
  components: downgraded components inherit the injector of the first
  other downgraded Angular 2 component they find up the DOM tree.

Closes #6629, #7727, #8729, #9643, #9649, #12675

modules/@angular/upgrade/src/util.ts

@@ -6,8 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-
-
 export function onError(e: any) {
   // TODO: (misko): We seem to not have a stack trace here!
   if (console.error) {
@@ -23,6 +21,19 @@ export function controllerKey(name: string): string {
   return '$' + name + 'Controller';
 }
 
+export function getAttributesAsArray(node: Node): string[][] {
+  const attributes = node.attributes;
+  let asArray: string[][];
+  if (attributes) {
+    let attrLen = attributes.length;
+    asArray = new Array(attrLen);
+    for (let i = 0; i < attrLen; i++) {
+      asArray[i] = [attributes[i].nodeName, attributes[i].nodeValue];
+    }
+  }
+  return asArray || [];
+}
+
 export class Deferred<R> {
   promise: Promise<R>;
   resolve: (value?: R|PromiseLike<R>) => void;
@@ -34,4 +45,4 @@ export class Deferred<R> {
       this.reject = rej;
     });
   }
-}
+}