fix(chips): Update chips in chip list, and add margin to chip input

Author: tinayuangao

src/lib/chips/chip-list.ts

@@ -344,6 +344,8 @@ export class MatChipList implements MatFormFieldControl<any>, ControlValueAccess
 
       // Check to see if we have a destroyed chip and need to refocus
       this._updateFocusForDestroyedChips();
+
+      this.stateChanges.next();
     });
   }
 

src/lib/chips/chips.scss

@@ -99,3 +99,7 @@ input.mat-chip-input {
   margin: $mat-chip-input-margin;
   flex: 1 0 $mat-chip-input-width;
 }
+
+.mat-form-field-type-mat-chip-list .mat-form-field-placeholder {
+  margin: $mat-chip-input-margin;
+}