Merge "Convert ViewNodeTest to androidx.test."

import android.content.Context;

import android.graphics.Matrix;

import android.support.test.InstrumentationRegistry;

import android.view.View;

import android.view.ViewStructure.HtmlInfo;

import android.view.contentcapture.ViewNode.ViewStructureImpl;

import androidx.test.InstrumentationRegistry;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;