cdk-drop-list: not add class .cdk-drop-list-dragging to CdkDropList container

[quangquy87]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

What is the current behavior?

I tried add ChangeDetectionStrategy.OnPush into component, cdk-drop not insert class .cdk-drop-list-dragging to CdkDropList container

What are the steps to reproduce?

Providing a StackBlitz reproduction is the best way to share your issue.

StackBlitz starter: https://stackblitz.com/edit/angular-xwyhj3?file=app/cdk-drag-drop-sorting-example.ts

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"@angular/animations": "^7.0.0",
"@angular/cdk": "^7.0.0",
"@angular/common": "^7.0.0",
"@angular/compiler": "^7.0.0",
"@angular/core": "^7.0.0",
"@angular/forms": "^7.0.0",
"@angular/http": "^7.0.0",
"@angular/material": "^7.0.0",
"@angular/material-moment-adapter": "^7.0.0",
"@angular/platform-browser": "^7.0.0",
"@angular/platform-browser-dynamic": "^7.0.0",
"@angular/router": "^7.0.0",
"angular-in-memory-web-api": "^0.6.1",
"core-js": "^2.5.7",
"hammerjs": "^2.0.8",
"moment": "^2.22.2",
"rxjs": "^6.3.3",
"web-animations-js": "^2.3.1",
"zone.js": "^0.8.26"

Is there anything else we should know?

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