fix(material-experimental/mdc-chips): add checkmark container (#17694)

Author: andrewseguin

src/material-experimental/mdc-chips/chip-option.html

@@ -1,7 +1,9 @@
 <ng-content select="mat-chip-avatar, [matChipAvatar]"></ng-content>
-<svg *ngIf="_chipListMultiple" class="mdc-chip__checkmark-svg" viewBox="-2 -3 30 30">
-  <path class="mdc-chip__checkmark-path" fill="none" stroke="black"
-    d="M1.73,12.91 8.1,19.28 22.79,4.59"/>
-</svg>
+<div class="mdc-chip__checkmark" *ngIf="_chipListMultiple">
+  <svg class="mdc-chip__checkmark-svg" viewBox="-2 -3 30 30">
+    <path class="mdc-chip__checkmark-path" fill="none" stroke="black"
+          d="M1.73,12.91 8.1,19.28 22.79,4.59"/>
+  </svg>
+</div>
 <div class="mdc-chip__text"><ng-content></ng-content></div>
 <ng-content select="mat-chip-trailing-icon,[matChipRemove],[matChipTrailingIcon]"></ng-content>