Photo Picker dialog: Add a test.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapViewHolder.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.photo_picker;
 
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.os.AsyncTask;
 import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.text.TextUtils;
 
+import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 
 import java.util.List;
 
 /**
  * Holds on to a {@link PickerBitmapView} that displays information about a picker bitmap.
  */
 public class PickerBitmapViewHolder
         extends ViewHolder implements DecoderServiceHost.ImageDecodedCallback {
     // Our parent category.
@@ skipping 78 matching lines @@
 
         mCategoryView.getDecoderServiceHost().decodeImage(filePath, size, this);
     }
 
     /**
      * Returns the file path of the current request.
      */
     public String getFilePath() {
         return mBitmapDetails == null ? null : mBitmapDetails.getFilePath();
     }
+
+    @VisibleForTesting
+    public boolean getImageLoadingForTesting() {
+        return mItemView.getImageLoadingForTesting();
+    }
 }