Enable Config::MUS to use classic IME instead of servicified IME.

ui/aura/mus/window_tree_host_mus.h

 // Copyright 2015 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.
 
 #ifndef UI_AURA_MUS_WINDOW_TREE_HOST_MUS_H_
 #define UI_AURA_MUS_WINDOW_TREE_HOST_MUS_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/ui/public/interfaces/window_manager_constants.mojom.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/window_tree_host_platform.h"
 
 namespace display {
 class Display;
 }
 
+namespace ui {
+class InputMethodChromeOS;
+}
+
 namespace aura {
 
 class InputMethodMus;
 class WindowTreeClient;
 class WindowTreeHostMusDelegate;
 
 struct WindowTreeHostMusInitParams;
 
 class AURA_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
  public:
   explicit WindowTreeHostMus(WindowTreeHostMusInitParams init_params);
 
   ~WindowTreeHostMus() override;
 
   // Returns the WindowTreeHostMus for |window|. This returns null if |window|
   // is null, or not in a WindowTreeHostMus.
   static WindowTreeHostMus* ForWindow(aura::Window* window);
 
   // Sets the bounds in pixels.
   void SetBoundsFromServer(const gfx::Rect& bounds_in_pixels);
 
   ui::EventDispatchDetails SendEventToSink(ui::Event* event) {
     return aura::WindowTreeHostPlatform::SendEventToSink(event);
   }
 
-  InputMethodMus* input_method() { return input_method_.get(); }
+  InputMethodMus* input_method_mus_for_testing() {
+    return input_method_mus_.get();
+  }
+
+  void DispatchEventToInputMethod(
+      ui::KeyEvent* event,
+      std::unique_ptr<base::Callback<void(bool)>> ack_callback);
 
   // Sets the client area on the underlying mus window.
   void SetClientArea(const gfx::Insets& insets,
                      const std::vector<gfx::Rect>& additional_client_area);
 
   // Sets the hit test mask on the underlying mus window. Pass base::nullopt to
   // clear.
   void SetHitTestMask(const base::Optional<gfx::Rect>& rect);
 
   // Sets the opacity of the underlying mus window.
@@ skipping 30 matching lines @@
   void SetBoundsInPixels(const gfx::Rect& bounds) override;
   void DispatchEvent(ui::Event* event) override;
   void OnClosed() override;
   void OnActivationChanged(bool active) override;
   void OnCloseRequest() override;
   gfx::ICCProfile GetICCProfileForCurrentDisplay() override;
   void MoveCursorToScreenLocationInPixels(
       const gfx::Point& location_in_pixels) override;
 
  private:
+  void InitInputMethod(WindowTreeHostMusInitParams* init_params);
+
   int64_t display_id_;
 
   WindowTreeHostMusDelegate* delegate_;
 
   bool in_set_bounds_from_server_ = false;
 
-  std::unique_ptr<InputMethodMus> input_method_;
+  std::unique_ptr<InputMethodMus> input_method_mus_;
+
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<ui::InputMethodChromeOS> input_method_chromeos_;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMus);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_TREE_HOST_MUS_H_