Implemented missing methods on android.view.contentcapture.ViewNode

Also fixed AssistStructure.ViewNodeBuilder.setVisibility() so it doesn't mess
up with the flags when it receives an invalid value.

Test: atest FrameworksCoreTests:android.view.contentcapture.ViewNodeTest
Test: atest CtsContentCaptureServiceTestCases

Fixes: 121135096

Change-Id: I2280c6922ca5a02aa4ed16ba3e8b39b9cb2f4b55
5 files changed