Add action for each button on opt-in IME menu.

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index b8a1acd78c4d3393e69913fbb14a5dc61bc4364e..dbbe67991f661bc8a0e87de2f8a6f8d190dc3efa 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -145,7 +145,7 @@ const base::Feature kOptInImeMenu{"OptInImeMenu",
 const base::Feature kQuickUnlockPin{"QuickUnlockPin",
                                     base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Enables or disables PIN quick unlock settings integration.
+// Enables or disables emoji, handwriting and voice input on opt-in IME menu.
 const base::Feature kEHVInputOnImeMenu{"EmojiHandwritingVoiceInput",
                                        base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)