[Enhanced Bookmark]Upstream image fetching code in android

chrome/browser/enhanced_bookmarks/android/bookmark_image_service_android.h

+// Copyright 2014 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 CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_
+#define CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_
+
+#include "components/enhanced_bookmarks/bookmark_image_service.h"
+#include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
+
+namespace chrome {
+class BitmapFetcher;
+}
+
+namespace content {
+class BrowserContext;
+class RenderFrameHost;
+class WebContents;
+}
+
+namespace enhanced_bookmarks {
+
+class BookmarkImageServiceAndroid : public BookmarkImageService {
+ public:
+  explicit BookmarkImageServiceAndroid(content::BrowserContext* browserContext);
+
+  void RetrieveSalientImage(const GURL& page_url,
+                            const GURL& image_url,
+                            const std::string& referrer,
+                            net::URLRequest::ReferrerPolicy referrer_policy,
+                            bool update_bookmark) override;
+
+  // Searches the current page for a salient image, if a url is found the image
+  // is fetched and stored.
+  void RetrieveSalientImageFromContext(
+      content::RenderFrameHost* render_frame_host,
+      const GURL& page_url,
+      bool update_bookmark);
+
+  // Investigates if the tab points to a bookmarked url in needs of an updated
+  // image. If it is, invokes RetrieveSalientImageFromContext() for the relevant
+  // urls.
+  void FinishSuccessfulPageLoadForTab(content::WebContents* web_contents,
+                                      bool update_bookmark);
+
+ private:
+  void RetrieveSalientImageFromContextCallback(const GURL& page_url,
+                                               bool update_bookmark,
+                                               const base::Value* result);
+
+  content::BrowserContext* browser_context_;
+  // The script injected in a page to extract image urls.
+  base::string16 script_;
+
+  class BitmapFetcherHandler : private chrome::BitmapFetcherDelegate {
+   public:
+    explicit BitmapFetcherHandler(BookmarkImageServiceAndroid* service,
+                                  const GURL& image_url)
+        : service_(service), bitmap_fetcher_(image_url, this) {}
+    void Start(content::BrowserContext* browser_context,
+               const std::string& referrer,
+               net::URLRequest::ReferrerPolicy referrer_policy,
+               int load_flags,
+               bool update_bookmark,
+               const GURL& page_url);
+    void OnFetchComplete(const GURL url, const SkBitmap* bitmap) override;
+
+   protected:
+    ~BitmapFetcherHandler() override {}
+
+   private:
+    BookmarkImageServiceAndroid* service_;
+    chrome::BitmapFetcher bitmap_fetcher_;
+    bool update_bookmark_;
+    GURL page_url_;
+
+    DISALLOW_COPY_AND_ASSIGN(BitmapFetcherHandler);
+  };
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkImageServiceAndroid);
+};
+
+}  // namespace enhanced_bookmarks
+
+#endif  // CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_