Adding CrHome-specific implementation for home page tile.

components/ntp_tiles/most_visited_sites.cc

Index: components/ntp_tiles/most_visited_sites.cc
diff --git a/components/ntp_tiles/most_visited_sites.cc b/components/ntp_tiles/most_visited_sites.cc
index 19c2f957f89efe1f1a5b08014a72b494071f9f95..81fe916f97cc8630a5f1c5b0c018cff7b77c8fe4 100644
--- a/components/ntp_tiles/most_visited_sites.cc
+++ b/components/ntp_tiles/most_visited_sites.cc
@@ -52,15 +52,13 @@ MostVisitedSites::MostVisitedSites(
     SuggestionsService* suggestions,
     std::unique_ptr<PopularSites> popular_sites,
     std::unique_ptr<IconCacher> icon_cacher,
-    std::unique_ptr<MostVisitedSitesSupervisor> supervisor,
-    std::unique_ptr<HomePageClient> home_page_client)
+    std::unique_ptr<MostVisitedSitesSupervisor> supervisor)
     : prefs_(prefs),
       top_sites_(top_sites),
       suggestions_service_(suggestions),
       popular_sites_(std::move(popular_sites)),
       icon_cacher_(std::move(icon_cacher)),
       supervisor_(std::move(supervisor)),
-      home_page_client_(std::move(home_page_client)),
       observer_(nullptr),
       num_sites_(0u),
       top_sites_observer_(this),
@@ -74,21 +72,6 @@ MostVisitedSites::MostVisitedSites(
     supervisor_->SetObserver(this);
 }
 
-MostVisitedSites::MostVisitedSites(
-    PrefService* prefs,
-    scoped_refptr<history::TopSites> top_sites,
-    SuggestionsService* suggestions,
-    std::unique_ptr<PopularSites> popular_sites,
-    std::unique_ptr<IconCacher> icon_cacher,
-    std::unique_ptr<MostVisitedSitesSupervisor> supervisor)
-    : MostVisitedSites(prefs,
-                       top_sites,
-                       suggestions,
-                       std::move(popular_sites),
-                       std::move(icon_cacher),
-                       std::move(supervisor),
-                       nullptr) {}
-
 MostVisitedSites::~MostVisitedSites() {
   if (supervisor_)
     supervisor_->SetObserver(nullptr);
@@ -111,6 +94,12 @@ bool MostVisitedSites::DoesSourceExist(TileSource source) const {
   return false;
 }
 
+void MostVisitedSites::SetHomePageClient(
+    std::unique_ptr<HomePageClient> client) {
+  DCHECK(client);
+  home_page_client_ = std::move(client);
+}
+
 void MostVisitedSites::SetMostVisitedURLsObserver(Observer* observer,
                                                   size_t num_sites) {
   DCHECK(observer);
@@ -491,9 +480,11 @@ void MostVisitedSites::TopSitesChanged(TopSites* top_sites,
 
 bool MostVisitedSites::ShouldAddHomeTile() const {
   return base::FeatureList::IsEnabled(kPinHomePageAsTileFeature) &&
-         num_sites_ > 0u && home_page_client_ &&
+         num_sites_ > 0u &&
+         home_page_client_ &&  // No platform-specific implementation - no tile.
          home_page_client_->IsHomePageEnabled() &&
          !home_page_client_->IsNewTabPageUsedAsHomePage() &&
+         !home_page_client_->GetHomepageUrl().is_empty() &&
          !(top_sites_ &&
            top_sites_->IsBlacklisted(home_page_client_->GetHomepageUrl()));
 }