feat(material/chips): expose _chipGrid in MatChipInput and add a stream of chip removal events (#28012)

Author: clamli

src/material/chips/chip-input.ts

@@ -75,16 +75,19 @@ export class MatChipInput implements MatChipTextControl, AfterContentInit, OnCha
 
   /** Whether the control is focused. */
   focused: boolean = false;
-  _chipGrid: MatChipGrid;
 
   /** Register input for chip list */
   @Input('matChipInputFor')
+  get chipGrid(): MatChipGrid {
+    return this._chipGrid;
+  }
   set chipGrid(value: MatChipGrid) {
     if (value) {
       this._chipGrid = value;
       this._chipGrid.registerInput(this);
     }
   }
+  _chipGrid: MatChipGrid;
 
   /**
    * Whether or not the chipEnd event will be emitted when the input is blurred.

src/material/chips/chip-set.ts

@@ -80,11 +80,16 @@ export class MatChipSet
     return this._getChipStream(chip => chip._onFocus);
   }
 
-  /** Combined stream of all of the child chips' remove events. */
+  /** Combined stream of all of the child chips' destroy events. */
   get chipDestroyedChanges(): Observable<MatChipEvent> {
     return this._getChipStream(chip => chip.destroyed);
   }
 
+  /** Combined stream of all of the child chips' remove events. */
+  get chipRemovedChanges(): Observable<MatChipEvent> {
+    return this._getChipStream(chip => chip.removed);
+  }
+
   /** Whether the chip set is disabled. */
   @Input()
   get disabled(): boolean {