[Android] Use Looper at BytecodeTest

classExists and checkSuperName were failing for DeveloperSettings.
Crash message said:
Can't create handler inside thread Thread[Instr: org.chromium.base.test.BaseChromiumAndroidJUnitRunner,5,main] that has not called Looper.prepare()

Related Chromium change: unclear

android/javatests/org/chromium/chrome/browser/BytecodeTest.java

@@ -13,6 +13,7 @@
 import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.Looper;
 import android.util.AttributeSet;
 import android.view.ActionMode;
 import android.view.View;
@@ -27,6 +28,7 @@
 import androidx.test.filters.SmallTest;
 
 import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -192,6 +194,11 @@ enum MethodModifier {
         STATIC
     }
 
+    @BeforeClass
+    public static void beforeClass() {
+        Looper.prepare();
+    }
+
     @Test
     @SmallTest
     public void testClassesExist() throws Exception {