Implement WebContents.downloadImage() on Java side

content/public/android/java/src/org/chromium/content_public/browser/DownloadImageCallback.java

Index: content/public/android/java/src/org/chromium/content_public/browser/DownloadImageCallback.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/DownloadImageCallback.java b/content/public/android/java/src/org/chromium/content_public/browser/DownloadImageCallback.java
new file mode 100644
index 0000000000000000000000000000000000000000..cd02f70a6a6aeeda16826f4c151d406281034724
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content_public/browser/DownloadImageCallback.java
@@ -0,0 +1,21 @@
+// 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.content_public.browser;
+
+import android.graphics.Bitmap;
+import android.graphics.Rect;
+
+import java.util.List;
+
+/**
+ * Java counterpart of native DownloadImageCallback.
+ */
+public interface DownloadImageCallback {

[mlamouri (slow - plz ping), 2016/05/31 16:18:37]

The native callback is called "ImageDownloadCallback". Maybe you should keep
that name for consistency.

[Zhiqiang Zhang (Slow), 2016/06/01 11:05:55]

Done.

+    /**
+     * Called when image downloading is completed.
+     */
+    void onFinishDownloadImage(int id, int httpStatusCode, String imageUrl, List<Bitmap> bitmaps,
+                               List<Rect> sizes);
+}