Download and show artwork in MediaMetdata in media notification

chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java
new file mode 100644
index 0000000000000000000000000000000000000000..4eb9ec3cca8451d28b0cb9e48494002ec22d917a
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java
@@ -0,0 +1,19 @@
+// Copyright 2016 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.media.ui;
+
+import android.graphics.Bitmap;
+
+/**
+ * The callback when an image is downloaded. This class is different with
+ * {@link ImageDownloadCallback} and is only used by {@link MediaImageManager}.
+ */
+public interface MediaImageCallback {
+    /**
+     * Called when image downloading is complete.
+     * @param bitmap The downloaded image.
+     */
+    void onImageDownloaded(Bitmap image);
+}