Add support to process favicons from Web Manifests

components/favicon/content/content_favicon_driver.h

 // Copyright 2015 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 COMPONENTS_FAVICON_CONTENT_CONTENT_FAVICON_DRIVER_H_
 #define COMPONENTS_FAVICON_CONTENT_CONTENT_FAVICON_DRIVER_H_
 
 #include "base/macros.h"
+#include "base/optional.h"
 #include "components/favicon/core/favicon_driver_impl.h"
 #include "content/public/browser/reload_type.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "url/gurl.h"
 
 namespace content {
 struct FaviconURL;
 class WebContents;
 }
@@ skipping 35 matching lines @@
                        bookmarks::BookmarkModel* bookmark_model);
   ~ContentFaviconDriver() override;
 
  private:
   friend class content::WebContentsUserData<ContentFaviconDriver>;
 
   // FaviconHandler::Delegate implementation.
   int DownloadImage(const GURL& url,
                     int max_image_size,
                     ImageDownloadCallback callback) override;
+  void DownloadManifest(const GURL& url,
+                        ManifestDownloadCallback callback) override;
   bool IsOffTheRecord() override;
   void OnFaviconUpdated(const GURL& page_url,
                         FaviconDriverObserver::NotificationIconType icon_type,
                         const GURL& icon_url,
                         bool icon_url_changed,
                         const gfx::Image& image) override;
 
   // content::WebContentsObserver implementation.
   void DidUpdateFaviconURL(
       const std::vector<content::FaviconURL>& candidates) override;
+  // TODO/DONOTSUBMIT(mastiz): Make this 'override'.
+  void DidUpdateManifestURL(const base::Optional<GURL>& manifest_url);
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
 
   GURL bypass_cache_page_url_;
   std::vector<content::FaviconURL> favicon_urls_;
+  // Whether DidUpdateManifestURL() was called at least once after
+  // DidStartNavigation(). Note that this doesn't imply an actual manifest URL,
+  // i.e. the page might not have a web manifest.
+  bool received_manifest_url_;
+  base::Optional<GURL> manifest_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentFaviconDriver);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CONTENT_CONTENT_FAVICON_DRIVER_H_