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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 73103c715b8157cb7c8492125309d334a1f36479..11a3ade9b3dae7b5ddbb7c1d3da2be3a7849ee77 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2289,6 +2289,7 @@ const Experiment kExperiments[] = {
         switches::kSyncServiceURL,
         "https://chrome-sync.sandbox.google.com/chrome-sync/alpha")
   },
+
   {
     "enable-child-account-detection",
     IDS_FLAGS_CHILD_ACCOUNT_DETECTION_NAME,
@@ -2411,6 +2412,20 @@ const Experiment kExperiments[] = {
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEmphasizeTitlesInOmniboxDropdown)
   },
+
+#if defined(ENABLE_SPELLCHECK) && \
+    (defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS))
+  {
+    "enable-multilingual-spellchecker",
+    IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_NAME,
+    IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_DESCRIPTION,
+    kOsWin | kOsLinux | kOsCrOS,
+    SINGLE_VALUE_TYPE(switches::kEnableMultilingualSpellChecker)
+  },
+#endif  // defined(ENABLE_SPELLCHECK) && (defined(OS_LINUX) || defined(OS_WIN)
+        // || defined(OS_CHROMEOS))
+
+
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.