Update all bookmarks which use an icon URL when a favicon's bitmap is updated

components/history/core/browser/history_backend.cc

Index: components/history/core/browser/history_backend.cc
diff --git a/components/history/core/browser/history_backend.cc b/components/history/core/browser/history_backend.cc
index 1110993c583f546d0b84c1d245aedc01a06cab74..0f39d0c8f715abce353b76fd8f56fc7ff97fab64 100644
--- a/components/history/core/browser/history_backend.cc
+++ b/components/history/core/browser/history_backend.cc
@@ -1599,9 +1599,11 @@ void HistoryBackend::MergeFavicon(
   favicon_base::FaviconID favicon_id =
       thumbnail_db_->GetFaviconIDForFaviconURL(icon_url, icon_type, nullptr);
 
+  bool favicon_created = false;
   if (!favicon_id) {
     // There is no favicon at |icon_url|, create it.
     favicon_id = thumbnail_db_->AddFavicon(icon_url, icon_type);
+    favicon_created = true;
   }
 
   std::vector<FaviconBitmapIDSize> bitmap_id_sizes;
@@ -1689,6 +1691,7 @@ void HistoryBackend::MergeFavicon(
 
   // Copy the favicon bitmaps mapped to |page_url| to the favicon at |icon_url|
   // till the limit of |kMaxFaviconBitmapsPerIconURL| is reached.
+  bool favicon_bitmaps_copied = false;
   for (size_t i = 0; i < icon_mappings.size(); ++i) {
     if (favicon_sizes.size() >= kMaxFaviconBitmapsPerIconURL)
       break;
@@ -1716,6 +1719,7 @@ void HistoryBackend::MergeFavicon(
           favicon_id, bitmaps_to_copy[j].bitmap_data, base::Time(),
           bitmaps_to_copy[j].pixel_size);
       favicon_sizes.push_back(bitmaps_to_copy[j].pixel_size);
+      favicon_bitmaps_copied = true;
 
       if (favicon_sizes.size() >= kMaxFaviconBitmapsPerIconURL)
         break;
@@ -1732,8 +1736,16 @@ void HistoryBackend::MergeFavicon(
     mapping_changed = true;
   }
 
-  if (mapping_changed || !bitmap_identical)
+  if (mapping_changed)
     SendFaviconChangedNotificationForPageAndRedirects(page_url);
+
+  if (!favicon_created && (!bitmap_identical || favicon_bitmaps_copied)) {
+    // If there was a favicon at |icon_url| prior to MergeFavicon() being
+    // called, there may be page URLs which also use the favicon at |icon_url|.
+    // Notify the UI that the favicon has changed for |icon_url|.
+    SendFaviconChangedNotificationForIconURL(icon_url);
+  }
+
   ScheduleCommit();
 }
 
@@ -1746,29 +1758,32 @@ void HistoryBackend::SetFavicons(const GURL& page_url,
 
   DCHECK_GE(kMaxFaviconBitmapsPerIconURL, bitmaps.size());
 
-  // Track whether the method modifies or creates any favicon bitmaps, favicons
-  // or icon mappings.
-  bool data_modified = false;
-
   favicon_base::FaviconID icon_id =
       thumbnail_db_->GetFaviconIDForFaviconURL(icon_url, icon_type, nullptr);
 
+  bool favicon_created = false;
   if (!icon_id) {
     icon_id = thumbnail_db_->AddFavicon(icon_url, icon_type);
-    data_modified = true;
+    favicon_created = true;
   }
 
-  data_modified |= SetFaviconBitmaps(icon_id, bitmaps);
+  bool favicon_data_modified = SetFaviconBitmaps(icon_id, bitmaps);
 
   std::vector<favicon_base::FaviconID> icon_ids(1u, icon_id);
-  data_modified |=
+  bool mapping_changed =
       SetFaviconMappingsForPageAndRedirects(page_url, icon_type, icon_ids);
 
-  if (data_modified) {
-    // Send notification to the UI as an icon mapping, favicon, or favicon
-    // bitmap was changed by this function.
+  if (mapping_changed) {
+    // Notify the UI that this function changed an icon mapping.
     SendFaviconChangedNotificationForPageAndRedirects(page_url);
   }
+
+  if (favicon_data_modified && !favicon_created) {
+    // If there was a favicon at |icon_url| prior to SetFavicons() being called,
+    // there may be page URLs which also use the favicon at |icon_url|. Notify
+    // the UI that the favicon has changed for |icon_url|.
+    SendFaviconChangedNotificationForIconURL(icon_url);
+  }
   ScheduleCommit();
 }
 
@@ -1794,7 +1809,7 @@ void HistoryBackend::SetImportedFavicons(
   Time now = Time::Now();
 
   // Track all URLs that had their favicons set or updated.
-  std::set<GURL> favicons_changed;
+  std::vector<GURL> favicons_changed;
 
   for (size_t i = 0; i < favicon_usage.size(); i++) {
     favicon_base::FaviconID favicon_id =
@@ -1828,7 +1843,7 @@ void HistoryBackend::SetImportedFavicons(
           url_info.set_hidden(false);
           db_->AddURL(url_info);
           thumbnail_db_->AddIconMapping(*url, favicon_id);
-          favicons_changed.insert(*url);
+          favicons_changed.push_back(*url);
         }
       } else {
         if (!thumbnail_db_->GetIconMappingsForPageURL(
@@ -1836,7 +1851,7 @@ void HistoryBackend::SetImportedFavicons(
           // URL is present in history, update the favicon *only* if it is not
           // set already.
           thumbnail_db_->AddIconMapping(*url, favicon_id);
-          favicons_changed.insert(*url);
+          favicons_changed.push_back(*url);
         }
       }
     }
@@ -1844,7 +1859,7 @@ void HistoryBackend::SetImportedFavicons(
 
   if (!favicons_changed.empty()) {
     // Send the notification about the changed favicon URLs.
-    NotifyFaviconChanged(favicons_changed);
+    NotifyFaviconsChanged(favicons_changed, std::vector<GURL>());
   }
 }
 
@@ -2173,11 +2188,18 @@ void HistoryBackend::SendFaviconChangedNotificationForPageAndRedirects(
   RedirectList redirect_list;
   GetCachedRecentRedirects(page_url, &redirect_list);
   if (!redirect_list.empty()) {
-    std::set<GURL> favicons_changed(redirect_list.begin(), redirect_list.end());
-    NotifyFaviconChanged(favicons_changed);
+    std::vector<GURL> favicons_changed(redirect_list.begin(),
+                                       redirect_list.end());
+    NotifyFaviconsChanged(favicons_changed, std::vector<GURL>());
   }
 }
 
+void HistoryBackend::SendFaviconChangedNotificationForIconURL(
+    const GURL& icon_url) {
+  NotifyFaviconsChanged(std::vector<GURL>(),
+                        std::vector<GURL>(1u, icon_url));
+}
+
 void HistoryBackend::Commit() {
   if (!db_)
     return;
@@ -2460,9 +2482,10 @@ void HistoryBackend::ProcessDBTask(
     ProcessDBTaskImpl();
 }
 
-void HistoryBackend::NotifyFaviconChanged(const std::set<GURL>& urls) {
+void HistoryBackend::NotifyFaviconsChanged(const std::vector<GURL>& page_urls,
+                                           const std::vector<GURL>& icon_urls) {
   if (delegate_)
-    delegate_->NotifyFaviconChanged(urls);
+    delegate_->NotifyFaviconsChanged(page_urls, icon_urls);
 }
 
 void HistoryBackend::NotifyURLVisited(ui::PageTransition transition,