Refactors androidx.compose.foundation:foundation to the androidx.compose.foundation package name

Bug: b/160233169
Test: ./gradlew checkApi
Relnote: N/A
Change-Id: Id234691730b9ba444ee2ef41423a17fe7dd2845d

diff --git a/ui/ui-test/src/androidTest/java/androidx/ui/test/IsDisplayedTest.kt b/ui/ui-test/src/androidTest/java/androidx/ui/test/IsDisplayedTest.kt
index 03670aa..5e2e6ff 100644
--- a/ui/ui-test/src/androidTest/java/androidx/ui/test/IsDisplayedTest.kt
+++ b/ui/ui-test/src/androidTest/java/androidx/ui/test/IsDisplayedTest.kt

@@ -36,8 +36,8 @@
 import androidx.ui.core.Layout
 import androidx.ui.core.Modifier
 import androidx.ui.core.setContent
-import androidx.ui.foundation.Box
-import androidx.ui.foundation.ScrollableColumn
+import androidx.compose.foundation.Box
+import androidx.compose.foundation.ScrollableColumn
 import androidx.ui.graphics.Color
 import androidx.ui.layout.Row
 import androidx.ui.layout.Stack