chore: audit @angular/core API classification (#8808)

modules/@angular/core/src/change_detection/change_detection_util.ts

@@ -34,6 +34,7 @@ export function devModeEqual(a: any, b: any): boolean {
  *    return WrappedValue.wrap(this._latestValue); // this will force update
  *  }
  * ```
+ * @stable
  */
 export class WrappedValue {
   constructor(public wrapped: any) {}
@@ -60,6 +61,7 @@ export class ValueUnwrapper {
 
 /**
  * Represents a basic change from a previous to a new value.
+ * @stable
  */
 export class SimpleChange {
   constructor(public previousValue: any, public currentValue: any) {}

modules/@angular/core/src/change_detection/change_detector_ref.ts

@@ -1,3 +1,6 @@
+/**
+ * @stable
+ */
 export abstract class ChangeDetectorRef {
   /**
    * Marks all {@link ChangeDetectionStrategy#OnPush} ancestors as to be checked.

modules/@angular/core/src/change_detection/constants.ts

@@ -28,6 +28,7 @@ export enum ChangeDetectorState {
 /**
  * Describes within the change detector which strategy will be used the next time change
  * detection is triggered.
+ * @stable
  */
 export enum ChangeDetectionStrategy {
   /**

modules/@angular/core/src/change_detection/differs/default_iterable_differ.ts

@@ -24,6 +24,9 @@ export class DefaultIterableDifferFactory implements IterableDifferFactory {
 
 var trackByIdentity = (index: number, item: any) => item;
 
+/**
+ * @stable
+ */
 export class DefaultIterableDiffer implements IterableDiffer {
   private _length: number = null;
   private _collection = null;
@@ -532,6 +535,9 @@ export class DefaultIterableDiffer implements IterableDiffer {
   }
 }
 
+/**
+ * @stable
+ */
 export class CollectionChangeRecord {
   currentIndex: number = null;
   previousIndex: number = null;

modules/@angular/core/src/change_detection/differs/default_keyvalue_differ.ts

@@ -335,6 +335,9 @@ export class DefaultKeyValueDiffer implements KeyValueDiffer {
 }
 
 
+/**
+ * @stable
+ */
 export class KeyValueChangeRecord {
   previousValue: any = null;
   currentValue: any = null;

modules/@angular/core/src/change_detection/differs/iterable_differs.ts

@@ -7,6 +7,8 @@ import {Provider, SkipSelfMetadata, OptionalMetadata} from '../../di';
 /**
  * A strategy for tracking changes over time to an iterable. Used for {@link NgFor} to
  * respond to changes in an iterable by effecting equivalent changes in the DOM.
+ * 
+ * @stable
  */
 export interface IterableDiffer {
   diff(object: any): any;
@@ -31,6 +33,7 @@ export interface IterableDifferFactory {
 /**
  * A repository of different iterable diffing strategies used by NgFor, NgClass, and others.
  * @ts2dart_const
+ * @stable
  */
 export class IterableDiffers {
   /*@ts2dart_const*/

modules/@angular/core/src/change_detection/differs/keyvalue_differs.ts

@@ -23,6 +23,7 @@ export interface KeyValueDifferFactory {
 /**
  * A repository of different Map diffing strategies used by NgClass, NgStyle, and others.
  * @ts2dart_const
+ * @stable
  */
 export class KeyValueDiffers {
   /*@ts2dart_const*/