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

chrome/browser/spellchecker/spellcheck_factory.cc

Index: chrome/browser/spellchecker/spellcheck_factory.cc
diff --git a/chrome/browser/spellchecker/spellcheck_factory.cc b/chrome/browser/spellchecker/spellcheck_factory.cc
index 7d7e1df68fa11fd40643e1065c3dc9c7e85e1362..faf85505d0bf44aa1e462101d2692b00df54ddf8 100644
--- a/chrome/browser/spellchecker/spellcheck_factory.cc
+++ b/chrome/browser/spellchecker/spellcheck_factory.cc
@@ -4,9 +4,11 @@
 
 #include "chrome/browser/spellchecker/spellcheck_factory.h"
 
+#include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/spellchecker/spellcheck_service.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/locale_settings.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ -67,6 +69,16 @@ KeyedService* SpellcheckServiceFactory::BuildServiceInstanceFor(
 
 void SpellcheckServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
+
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kEnableMultilingualSpellChecker)) {
+    user_prefs->RegisterStringPref(
+        prefs::kSpellCheckDictionaries,
+        l10n_util::GetStringUTF8(IDS_SPELLCHECK_DICTIONARY),
+        user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  }
+
   // TODO(estade): IDS_SPELLCHECK_DICTIONARY should be an ASCII string.
   user_prefs->RegisterStringPref(
       prefs::kSpellCheckDictionary,

[please use gerrit instead, 2015/02/23 18:51:47]

No need to register kSpellCheckDictionary pref when multi-lingual spellchecker
is enabled.

[Klemen Forstnerič, 2015/02/24 21:57:45]

Done. Do I also create a separate IDS_SPELLCHECK_DICTIONARIES or can I reuse the
IDS_SPELLCHECK_DICTIONARY?

[please use gerrit instead, 2015/02/24 23:38:38]

Let's use the new IDS_SPELLCHECK_DICTIONARIES, because there may be unforeseen
consequences of storing two different data types in two different locations. The
code that expects commas will handle no comma case, but the code that does not
expect commas might choke if it encounters a comma.

[Klemen Forstnerič, 2015/02/25 10:00:00]

I agree, I will make the change.