Bug 1698786: part 4) Add some logging to `EditorSpellChecker`. r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D108624

editor/spellchecker/EditorSpellCheck.cpp

@@ -15,6 +15,7 @@
 #include "mozilla/intl/LocaleService.h"    // for retrieving app locale
 #include "mozilla/intl/MozLocale.h"        // for mozilla::intl::Locale
 #include "mozilla/intl/OSPreferences.h"    // for mozilla::intl::OSPreferences
+#include "mozilla/Logging.h"               // for mozilla::LazyLogModule
 #include "mozilla/mozalloc.h"              // for operator delete, etc
 #include "mozilla/mozSpellChecker.h"       // for mozSpellChecker
 #include "mozilla/Preferences.h"           // for Preferences
@@ -50,6 +51,8 @@ using namespace dom;
 using intl::LocaleService;
 using intl::OSPreferences;
 
+static mozilla::LazyLogModule sEditorSpellChecker("EditorSpellChecker");
+
 class UpdateDictionaryHolder {
  private:
   EditorSpellCheck* mSpellCheck;
@@ -410,6 +413,8 @@ EditorSpellCheck::InitSpellChecker(nsIEditor* aEditor,
 
 NS_IMETHODIMP
 EditorSpellCheck::GetNextMisspelledWord(nsAString& aNextMisspelledWord) {
+  MOZ_LOG(sEditorSpellChecker, LogLevel::Debug, ("%s", __FUNCTION__));
+
   NS_ENSURE_TRUE(mSpellChecker, NS_ERROR_NOT_INITIALIZED);
 
   DeleteSuggestedWordList();