Fix the issue that 3rd party IME cannot be activated after user login.

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 072a3b2b8dac7e0f5986b41a6fab648adda4cd35..4501e0b49cba7666d3c8d0ea7a14819aa4f21309 100644
--- a/chrome/browser/chromeos/input_method/input_method_manager_impl.cc
+++ b/chrome/browser/chromeos/input_method/input_method_manager_impl.cc
@@ -317,6 +317,13 @@ bool InputMethodManagerImpl::ChangeInputMethodInternal(
 
   // Sanity check.
   if (!InputMethodIsActivated(input_method_id)) {
+    // For 3rd party IME, when the user just logged in, SetEnabledExtensionImes
+    // happens after activating the 3rd party IME.
+    // So here to record the 3rd party IME to be activated, and activate it
+    // when SetEnabledExtensionImes happens later.
+    if (extension_ime_util::IsExtensionIME(input_method_id))
+      pending_input_method_id_ = input_method_id;
+
     scoped_ptr<InputMethodDescriptors> input_methods(GetActiveInputMethods());
     DCHECK(!input_methods->empty());
     input_method_id_to_switch = input_methods->at(0).id();
@@ -526,6 +533,7 @@ void InputMethodManagerImpl::SetEnabledExtensionImes(
                                  ids->end());
 
   bool active_imes_changed = false;
+  bool switch_to_pending = false;
 
   for (std::map<std::string, InputMethodDescriptor>::iterator extra_iter =
        extra_input_methods_.begin(); extra_iter != extra_input_methods_.end();
@@ -533,6 +541,10 @@ void InputMethodManagerImpl::SetEnabledExtensionImes(
     if (extension_ime_util::IsComponentExtensionIME(
         extra_iter->first))
       continue;  // Do not filter component extension.
+
+    if (pending_input_method_id_ == extra_iter->first)
+      switch_to_pending = true;
+
     std::vector<std::string>::iterator active_iter = std::find(
         active_input_method_ids_.begin(), active_input_method_ids_.end(),
         extra_iter->first);
@@ -553,9 +565,14 @@ void InputMethodManagerImpl::SetEnabledExtensionImes(
   if (active_imes_changed) {
     MaybeInitializeCandidateWindowController();
 
-    // If |current_input_method| is no longer in |active_input_method_ids_|,
-    // switch to the first one in |active_input_method_ids_|.
-    ChangeInputMethod(current_input_method_.id());
+    if (switch_to_pending) {
+      ChangeInputMethod(pending_input_method_id_);
+      pending_input_method_id_.clear();
+    } else {
+      // If |current_input_method| is no longer in |active_input_method_ids_|,
+      // switch to the first one in |active_input_method_ids_|.
+      ChangeInputMethod(current_input_method_.id());
+    }
   }
 }