Set theme explicitly to fix tests on older APIs.

This fixes b/174743340 and b/174743258.

Test: N/A

Change-Id: I3eb437a824218b131ad124ccc1a82a35a04a24db

diff --git a/slices/view/src/androidTest/java/androidx/slice/widget/SliceStyleTest.java b/slices/view/src/androidTest/java/androidx/slice/widget/SliceStyleTest.java
index 3f98f01..8a2b761 100644
--- a/slices/view/src/androidTest/java/androidx/slice/widget/SliceStyleTest.java
+++ b/slices/view/src/androidTest/java/androidx/slice/widget/SliceStyleTest.java

@@ -48,6 +48,7 @@
 
     @Before
     public void setup() {
+        mContext.setTheme(R.style.AppTheme);
         // Empty XML file to initialize empty AttributeSet.
         XmlPullParser parser = mContext.getResources().getXml(R.xml.slice_style_test);
         AttributeSet attributes = Xml.asAttributeSet(parser);

diff --git a/slices/view/src/androidTest/java/androidx/slice/widget/SliceViewTest.java b/slices/view/src/androidTest/java/androidx/slice/widget/SliceViewTest.java
index f9dcce2..4fc92c0 100644
--- a/slices/view/src/androidTest/java/androidx/slice/widget/SliceViewTest.java
+++ b/slices/view/src/androidTest/java/androidx/slice/widget/SliceViewTest.java

@@ -74,6 +74,7 @@
     @Before
     @UiThreadTest
     public void setup() {
+        mContext.setTheme(R.style.AppTheme);
         mSliceView = new SliceView(mContext);
         SliceProvider.setSpecs(SliceLiveData.SUPPORTED_SPECS);
     }