Add baked-in favicons for default popular sites on NTP

components/ntp_tiles/icon_cacher_impl.cc

 // 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.
 
 #include "components/ntp_tiles/icon_cacher_impl.h"
 
 #include <utility>
 
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon/core/favicon_util.h"
 #include "components/favicon_base/favicon_types.h"
 #include "components/favicon_base/favicon_util.h"
 #include "components/image_fetcher/image_fetcher.h"
+#include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
 #include "url/gurl.h"
 
 namespace ntp_tiles {
 
 namespace {
 
 favicon_base::IconType IconType(const PopularSites::Site& site) {
   return site.large_icon_url.is_valid() ? favicon_base::TOUCH_ICON
                                         : favicon_base::FAVICON;
@@ skipping 10 matching lines @@
     favicon::FaviconService* favicon_service,
     std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher)
     : favicon_service_(favicon_service),
       image_fetcher_(std::move(image_fetcher)) {
   image_fetcher_->SetDataUseServiceName(
       data_use_measurement::DataUseUserData::NTP_TILES);
 }
 
 IconCacherImpl::~IconCacherImpl() = default;
 
-void IconCacherImpl::StartFetch(PopularSites::Site site,
-                                const base::Callback<void(bool)>& done) {
+void IconCacherImpl::StartFetch(
+    PopularSites::Site site,
+    const base::Callback<void(bool)>& icon_available) {
   favicon::GetFaviconImageForPageURL(
       favicon_service_, site.url, IconType(site),
       base::Bind(&IconCacherImpl::OnGetFaviconImageForPageURLFinished,
-                 base::Unretained(this), std::move(site), done),
+                 base::Unretained(this), std::move(site), icon_available),
       &tracker_);
 }
 
 void IconCacherImpl::OnGetFaviconImageForPageURLFinished(
     PopularSites::Site site,
-    const base::Callback<void(bool)>& done,
+    const base::Callback<void(bool)>& icon_available,
     const favicon_base::FaviconImageResult& result) {
   if (!result.image.IsEmpty()) {
-    done.Run(false);
+    icon_available.Run(false);
     return;
   }
 
+  if (ProvideDefaultIcon(site)) {
+    icon_available.Run(true);
+    // Don't return. We want to fetch to update possibly stale images.
+  }
+
   image_fetcher_->StartOrQueueNetworkRequest(
       std::string(), IconURL(site),
       base::Bind(&IconCacherImpl::OnFaviconDownloaded, base::Unretained(this),
-                 site, done));
+                 site, icon_available));
 }
 
-void IconCacherImpl::OnFaviconDownloaded(PopularSites::Site site,
-                                         const base::Callback<void(bool)>& done,
-                                         const std::string& id,
-                                         const gfx::Image& fetched_image) {
+void IconCacherImpl::OnFaviconDownloaded(
+    PopularSites::Site site,
+    const base::Callback<void(bool)>& icon_available,
+    const std::string& id,
+    const gfx::Image& fetched_image) {
   if (fetched_image.IsEmpty()) {
-    done.Run(false);
+    icon_available.Run(false);
     return;
   }
 
-  gfx::Image image = fetched_image;
+  SaveIconForSite(site, fetched_image);
+  icon_available.Run(true);
+}
+
+void IconCacherImpl::SaveIconForSite(const PopularSites::Site& site,
+                                     gfx::Image image) {
   favicon_base::SetFaviconColorSpace(&image);
   favicon_service_->SetFavicons(site.url, IconURL(site), IconType(site), image);
-  done.Run(true);
+}
+
+bool IconCacherImpl::ProvideDefaultIcon(const PopularSites::Site& site) {
+  if (site.default_resource_id < 0) {
+    return false;
+  }
+  SaveIconForSite(site, ResourceBundle::GetSharedInstance().GetNativeImageNamed(
+                            site.default_resource_id));
+  return true;
 }
 
 }  // namespace ntp_tiles