Merge "Add SysuiTestCase.runOnMainThreadAndWaitForIdleSync()" into main

import com.android.systemui.kosmos.testCase

fun SysuiTestCase.testKosmos(): Kosmos = Kosmos().apply { testCase = this@testKosmos }

/** Run [f] on the main thread and return its result once completed. */

fun <T : Any> SysuiTestCase.runOnMainThreadAndWaitForIdleSync(f: () -> T): T {

    lateinit var result: T

    context.mainExecutor.execute { result = f() }

    waitForIdleSync()

    return result

}