From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <sattard@slack-corp.com>
Date: Sun, 1 Mar 2020 16:33:55 -0800
Subject: feat: allow embedders to add observers on created hunspell
 dictionaries

This patch is used by Electron to implement spellchecker events.

diff --git a/chrome/browser/spellchecker/spellcheck_service.cc b/chrome/browser/spellchecker/spellcheck_service.cc
index fb1ce87c18a72deb815b78b2f989fe0a8ebaf0bc..417e89f3ba808d9e599d391d57df0e481afb5522 100644
--- a/chrome/browser/spellchecker/spellcheck_service.cc
+++ b/chrome/browser/spellchecker/spellcheck_service.cc
@@ -468,6 +468,9 @@ void SpellcheckService::LoadDictionaries() {
         std::make_unique<SpellcheckHunspellDictionary>(
             dictionary, platform_spellcheck_language, context_, this));
     hunspell_dictionaries_.back()->AddObserver(this);
+    if (hunspell_observer_) {
+      hunspell_dictionaries_.back()->AddObserver(hunspell_observer_);
+    }
     hunspell_dictionaries_.back()->Load();
   }
 
@@ -520,6 +523,20 @@ bool SpellcheckService::IsSpellcheckEnabled() const {
          (!hunspell_dictionaries_.empty() || enable_if_uninitialized);
 }
 
+void SpellcheckService::SetHunspellObserver(SpellcheckHunspellDictionary::Observer* observer) {
+  if (hunspell_observer_) {
+    for (auto& dict : hunspell_dictionaries_) {
+      dict->RemoveObserver(hunspell_observer_);
+    }
+  }
+  if (observer) {
+    for (auto& dict : hunspell_dictionaries_) {
+      dict->AddObserver(observer);
+    }
+  }
+  hunspell_observer_ = observer;
+}
+
 void SpellcheckService::Observe(int type,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& details) {
diff --git a/chrome/browser/spellchecker/spellcheck_service.h b/chrome/browser/spellchecker/spellcheck_service.h
index c17c42fdfd943e7b77e0d7a8d333afd70e9c6abc..ab9ef6b1efdd63ea7cc47be2cf7de79eb9aa1b90 100644
--- a/chrome/browser/spellchecker/spellcheck_service.h
+++ b/chrome/browser/spellchecker/spellcheck_service.h
@@ -138,6 +138,8 @@ class SpellcheckService : public KeyedService,
   // dictionaries available.
   bool IsSpellcheckEnabled() const;
 
+  void SetHunspellObserver(SpellcheckHunspellDictionary::Observer* observer);
+
   // NotificationProfile implementation.
   void Observe(int type,
                const content::NotificationSource& source,
@@ -305,6 +307,8 @@ class SpellcheckService : public KeyedService,
   // A pointer to the BrowserContext which this service refers to.
   raw_ptr<content::BrowserContext> context_;
 
+  SpellcheckHunspellDictionary::Observer* hunspell_observer_ = nullptr;
+
   std::unique_ptr<SpellCheckHostMetrics> metrics_;
 
   std::unique_ptr<SpellcheckCustomDictionary> custom_dictionary_;
