Check the IME component extension's availability on linux_chromeos, so that system fallback VK can …

chrome/browser/chromeos/input_method/input_method_manager_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/input_method/input_method_manager_impl.h"
 
 #include <algorithm>  // std::find
 
 #include <sstream>
 
@@ skipping 18 matching lines @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/ime/component_extension_ime_manager.h"
 #include "chromeos/ime/extension_ime_util.h"
 #include "chromeos/ime/fake_ime_keyboard.h"
 #include "chromeos/ime/ime_keyboard.h"
 #include "chromeos/ime/input_method_delegate.h"
 #include "components/user_manager/user_manager.h"
 #include "third_party/icu/source/common/unicode/uloc.h"
 #include "ui/base/accelerators/accelerator.h"
+#include "ui/keyboard/keyboard_controller.h"
+#include "ui/keyboard/keyboard_util.h"
 
 namespace chromeos {
 namespace input_method {
 
 namespace {
 
 bool Contains(const std::vector<std::string>& container,
               const std::string& value) {
   return std::find(container.begin(), container.end(), value) !=
       container.end();
@@ skipping 858 matching lines @@
   // This must be after |current_input_method| has been set to new input
   // method, because engine's Enable() method needs to access it.
   const std::string& extension_id =
       extension_ime_util::GetExtensionIDFromInputMethodID(descriptor.id());
   const std::string& component_id =
       extension_ime_util::GetComponentIDByInputMethodID(descriptor.id());
   engine = engine_map_[extension_id];
 
   IMEBridge::Get()->SetCurrentEngineHandler(engine);
 
-  if (engine)
+  if (engine) {
     engine->Enable(component_id);
+  } else {
+    // If no engine to enable, cancel the virtual keyboard url override so that
+    // it can use the fallback system virtual keyboard UI.
+    keyboard::SetOverrideContentUrl(GURL());
+    keyboard::KeyboardController* keyboard_controller =
+        keyboard::KeyboardController::GetInstance();
+    if (keyboard_controller)
+      keyboard_controller->Reload();
+  }
 
   // Change the keyboard layout to a preferred layout for the input method.
   if (!keyboard_->SetCurrentKeyboardLayoutByName(
           descriptor.GetPreferredKeyboardLayout())) {
     LOG(ERROR) << "Failed to change keyboard layout to "
                << descriptor.GetPreferredKeyboardLayout();
   }
 
   // Update input method indicators (e.g. "US", "DV") in Chrome windows.
   FOR_EACH_OBSERVER(InputMethodManager::Observer,
@@ skipping 109 matching lines @@
   if (candidate_window_controller_.get())
     return;
 
   candidate_window_controller_.reset(
       CandidateWindowController::CreateCandidateWindowController());
   candidate_window_controller_->AddObserver(this);
 }
 
 }  // namespace input_method
 }  // namespace chromeos