Implement WebContents.downloadImage() on Java side

content/browser/web_contents/web_contents_android.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 172 matching lines @@
   void ReloadLoFiImages(JNIEnv* env,
                         const base::android::JavaParamRef<jobject>& obj);
 
   void set_synchronous_compositor_client(SynchronousCompositorClient* client) {
     synchronous_compositor_client_ = client;
   }
   SynchronousCompositorClient* synchronous_compositor_client() const {
     return synchronous_compositor_client_;
   }
 
+  void DownloadImage(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& obj,
+                     const base::android::JavaParamRef<jstring>& url,
+                     jboolean is_fav_icon,
+                     jint max_bitmap_size,
+                     jboolean bypass_cache,
+                     const base::android::JavaParamRef<jobject>& jcallback);
+
  private:
   RenderWidgetHostViewAndroid* GetRenderWidgetHostViewAndroid();
 
   void OnFinishGetContentBitmap(
       base::android::ScopedJavaGlobalRef<jobject>* obj,
       base::android::ScopedJavaGlobalRef<jobject>* callback,
       const SkBitmap& bitmap,
       ReadbackResponse response);
 
+  void OnFinishDownloadImage(
+      base::android::ScopedJavaGlobalRef<jobject>* obj,
+      base::android::ScopedJavaGlobalRef<jobject>* callback,
+      int id,
+      int http_status_code,
+      const GURL& url,
+      const std::vector<SkBitmap>& bitmaps,
+      const std::vector<gfx::Size>& sizes);
+
   WebContentsImpl* web_contents_;
   NavigationControllerAndroid navigation_controller_;
   base::android::ScopedJavaGlobalRef<jobject> obj_;
   SynchronousCompositorClient* synchronous_compositor_client_;
 
   base::WeakPtrFactory<WebContentsAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_