Move TestUtil in gif decoder into test package.

third_party/gif_decoder/src/androidTest/java/com/bumptech/glide/gifdecoder/GifDecoderTest.java

 package com.bumptech.glide.gifdecoder;
 
 import android.graphics.Bitmap;
+import com.bumptech.glide.gifdecoder.test.TestUtil;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -15,7 +16,7 @@ import static org.junit.Assert.assertNotNull;
  * Tests for {@link com.bumptech.glide.gifdecoder.GifDecoder}.
  */
 @RunWith(RobolectricTestRunner.class)
-@Config(emulateSdk = 18)
+@Config(manifest = Config.NONE, emulateSdk = 18)
 public class GifDecoderTest {
 
     private MockProvider provider;

third_party/gif_decoder/src/androidTest/java/com/bumptech/glide/gifdecoder/GifHeaderParserTest.java

 package com.bumptech.glide.gifdecoder;
 
 import com.bumptech.glide.gifdecoder.test.GifBytesTestUtil;
+import com.bumptech.glide.gifdecoder.test.TestUtil;
 import org.junit.Before;
 import org.junit.Test;
 

third_party/gif_decoder/src/androidTest/java/com/bumptech/glide/gifdecoder/TestUtil.java → third_party/gif_decoder/src/androidTest/java/com/bumptech/glide/gifdecoder/test/TestUtil.java

-package com.bumptech.glide.gifdecoder;
+package com.bumptech.glide.gifdecoder.test;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
-final class TestUtil {
+/**
+ * Utility methods for GifDecoder tests.
+ */
+public final class TestUtil {
 
     private TestUtil() {
         // Utility class.