Add an option in language settings for activating the IME menu.

chrome/browser/chromeos/input_method/input_method_manager_impl.cc

Index: chrome/browser/chromeos/input_method/input_method_manager_impl.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_manager_impl.cc b/chrome/browser/chromeos/input_method/input_method_manager_impl.cc
index 7f75d6b53baee96ccf56e6c6c729af416fb1f38b..e35ab968f54de5fa0e51ac60ede541febb275a4e 100644
--- a/chrome/browser/chromeos/input_method/input_method_manager_impl.cc
+++ b/chrome/browser/chromeos/input_method/input_method_manager_impl.cc
@@ -889,6 +889,11 @@ void InputMethodManagerImpl::AddCandidateWindowObserver(
   candidate_window_observers_.AddObserver(observer);
 }
 
+void InputMethodManagerImpl::AddImeMenuObserver(
+    InputMethodManager::ImeMenuObserver* observer) {
+  ime_menu_observers_.AddObserver(observer);

[Shu Chen, 2015/12/28 16:41:47]

pls put this behind a flag.

+}
+
 void InputMethodManagerImpl::RemoveObserver(
     InputMethodManager::Observer* observer) {
   observers_.RemoveObserver(observer);
@@ -899,6 +904,11 @@ void InputMethodManagerImpl::RemoveCandidateWindowObserver(
   candidate_window_observers_.RemoveObserver(observer);
 }
 
+void InputMethodManagerImpl::RemoveImeMenuObserver(
+    InputMethodManager::ImeMenuObserver* observer) {
+  ime_menu_observers_.RemoveObserver(observer);
+}
+
 InputMethodManager::UISessionState InputMethodManagerImpl::GetUISessionState() {
   return ui_session_;
 }
@@ -1153,6 +1163,16 @@ void InputMethodManagerImpl::CandidateWindowClosed() {
                     CandidateWindowClosed(this));
 }
 
+void InputMethodManagerImpl::ImeMenuActivated() {
+  FOR_EACH_OBSERVER(InputMethodManager::ImeMenuObserver, ime_menu_observers_,
+                    ImeMenuActivated(this));
+}
+
+void InputMethodManagerImpl::ImeMenuDeactivated() {
+  FOR_EACH_OBSERVER(InputMethodManager::ImeMenuObserver, ime_menu_observers_,
+                    ImeMenuDeactivated(this));
+}
+
 void InputMethodManagerImpl::MaybeInitializeCandidateWindowController() {
   if (candidate_window_controller_.get())
     return;