[Remote suggestions] Use Google server for fetching MostLikely icons

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/core/large_icon_service.h"
+#include "components/favicon_base/fallback_icon_style.h"
 #include "components/favicon_base/favicon_types.h"
 #include "components/favicon_base/favicon_util.h"
 #include "components/image_fetcher/image_fetcher.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;
 }
 
 const GURL& IconURL(const PopularSites::Site& site) {
   return site.large_icon_url.is_valid() ? site.large_icon_url
                                         : site.favicon_url;
 }
 
+bool LargeIconResultEmpty(const favicon_base::LargeIconResult& result) {
+  // We should not fetch anything if the cache already contains a favicon of any
+  // size and type. Any icon results either in a bitmap or in a non-default
+  // fallback color.
+  return (!result.bitmap.is_valid() &&
+          (!result.fallback_icon_style ||
+           result.fallback_icon_style->is_default_background_color));
+}
+
 }  // namespace
 
 IconCacherImpl::IconCacherImpl(
     favicon::FaviconService* favicon_service,
+    favicon::LargeIconService* large_icon_service,
     std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher)
     : favicon_service_(favicon_service),
+      large_icon_service_(large_icon_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::StartFetchPopularSites(
+    PopularSites::Site site,
+    const base::Callback<void(bool)>& done) {
   favicon::GetFaviconImageForPageURL(
       favicon_service_, site.url, IconType(site),
       base::Bind(&IconCacherImpl::OnGetFaviconImageForPageURLFinished,
                  base::Unretained(this), std::move(site), done),
       &tracker_);
 }
 
 void IconCacherImpl::OnGetFaviconImageForPageURLFinished(
     PopularSites::Site site,
     const base::Callback<void(bool)>& done,
     const favicon_base::FaviconImageResult& result) {
   if (!result.image.IsEmpty()) {
     done.Run(false);
     return;
   }
 
   image_fetcher_->StartOrQueueNetworkRequest(
       std::string(), IconURL(site),
-      base::Bind(&IconCacherImpl::OnFaviconDownloaded, base::Unretained(this),
-                 site, done));
+      base::Bind(&IconCacherImpl::OnPopularSitesFaviconDownloaded,
+                 base::Unretained(this), site, done));
 }
 
-void IconCacherImpl::OnFaviconDownloaded(PopularSites::Site site,
-                                         const base::Callback<void(bool)>& done,
-                                         const std::string& id,
-                                         const gfx::Image& fetched_image) {
+void IconCacherImpl::OnPopularSitesFaviconDownloaded(
+    PopularSites::Site site,
+    const base::Callback<void(bool)>& done,
+    const std::string& id,
+    const gfx::Image& fetched_image) {
   if (fetched_image.IsEmpty()) {
     done.Run(false);
     return;
   }
 
   gfx::Image image = fetched_image;
   favicon_base::SetFaviconColorSpace(&image);
   favicon_service_->SetFavicons(site.url, IconURL(site), IconType(site), image);
   done.Run(true);
 }
 
+void IconCacherImpl::StartFetchMostLikely(
+    const GURL& page_url,
+    const base::Callback<void(bool)>& done) {
+  large_icon_service_->GetLargeIconOrFallbackStyle(
+      page_url, 48, 0,
+      base::Bind(&IconCacherImpl::OnGetLargeIconOrFallbackStyleFinished,
+                 base::Unretained(this), page_url, done),
+      &tracker_);
+}
+
+void IconCacherImpl::OnGetLargeIconOrFallbackStyleFinished(
+    const GURL& page_url,
+    const base::Callback<void(bool)>& done,
+    const favicon_base::LargeIconResult& result) {
+  if (!LargeIconResultEmpty(result)) {
+    DLOG(WARNING) << "large cache HIT for " << page_url.spec();
+    done.Run(false);
+    return;
+  }
+
+  DLOG(WARNING) << "large cache MISS for " << page_url.spec();
+
+  large_icon_service_
+      ->GetLargeIconOrFallbackStyleFromGoogleServerSkippingLocalCache(
+          page_url, 48, 0,
+          base::Bind(&IconCacherImpl::OnMostLikelyFaviconDownloaded,
+                     base::Unretained(this), page_url, done),
+          &tracker_);
+}
+
+void IconCacherImpl::OnMostLikelyFaviconDownloaded(
+    const GURL& page_url,
+    const base::Callback<void(bool)>& done,
+    const favicon_base::LargeIconResult& result) {
+  if (LargeIconResultEmpty(result)) {
+    DLOG(WARNING) << "large Google MISS for " << page_url.spec();
+    done.Run(false);
+    return;
+  }
+
+  DLOG(WARNING) << "large Google HIT for " << page_url.spec();
+
+  done.Run(true);
+}
+
 }  // namespace ntp_tiles