Enables the user to select multiple languages for spellchecking (UI)

chrome/common/spellcheck_common.cc

Index: chrome/common/spellcheck_common.cc
diff --git a/chrome/common/spellcheck_common.cc b/chrome/common/spellcheck_common.cc
index 372c106b17652d694856978ff1a64df01cba5322..ce138ca1321f4e07b5cd6b52a0717f9ea2452269 100644
--- a/chrome/common/spellcheck_common.cc
+++ b/chrome/common/spellcheck_common.cc
@@ -4,9 +4,14 @@
 
 #include "chrome/common/spellcheck_common.h"
 
+#include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string_split.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/pref_names.h"
 #include "third_party/icu/source/common/unicode/uloc.h"
 #include "third_party/icu/source/common/unicode/urename.h"
 #include "third_party/icu/source/common/unicode/utypes.h"
@@ -181,5 +186,23 @@ void GetISOLanguageCountryCodeFromLocale(const std::string& locale,
   *country_code = std::string(country);
 }
 
+std::vector<std::string> GetDictionaryLanguagesPref(PrefService* prefs) {
+  std::vector<std::string> dictionary_languages;
+  if (MultilingualSpellcheckIsEnabled()) {
+    base::SplitString(prefs->GetString(prefs::kSpellCheckDictionaries),
+                      kDictionaryLanguagesSeparator, &dictionary_languages);
+  } else {
+    dictionary_languages.push_back(
+        prefs->GetString(prefs::kSpellCheckDictionary));
+  }
+
+  return dictionary_languages;
+}
+
+bool MultilingualSpellcheckIsEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableMultilingualSpellChecker);
+}
+
 }  // namespace spellcheck_common
 }  // namespace chrome