Make the virtual keyboard show up on the display with input focus.

ash/virtual_keyboard_controller.h

 // Copyright 2014 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 ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_
 #define ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_
 
+#include <stdint.h>
+
 #include "ash/ash_export.h"
 #include "ash/common/shell_observer.h"
 #include "base/macros.h"
 #include "ui/events/devices/input_device_event_observer.h"
+#include "ui/keyboard/keyboard_layout_delegate.h"
 
 namespace ash {
 
 // This class observes input device changes for the virtual keyboard.
 class ASH_EXPORT VirtualKeyboardController
     : public ShellObserver,
-      public ui::InputDeviceEventObserver {
+      public ui::InputDeviceEventObserver,
+      public keyboard::KeyboardLayoutDelegate {
  public:
   VirtualKeyboardController();
   ~VirtualKeyboardController() override;
 
   // ShellObserver:
   // TODO(rsadam@): Remove when autovirtual keyboard flag is on by default.
   void OnMaximizeModeStarted() override;
   void OnMaximizeModeEnded() override;
 
   // ui::InputDeviceObserver:
   void OnTouchscreenDeviceConfigurationChanged() override;
   void OnKeyboardDeviceConfigurationChanged() override;
 
   // Toggles whether the presense of an external keyboard should be ignored
   // when determining whether or not to show the on-screen keyboard.
   void ToggleIgnoreExternalKeyboard();
 
+  // keyboard::KeyboardLayoutDelegate
+  void MoveKeyboardToAnotherDisplayIfNeeded(int64_t display_id) override;
+
  private:
   // Updates the list of active input devices.
   void UpdateDevices();
 
   // Updates the keyboard state.
   void UpdateKeyboardEnabled();
 
   // Creates the keyboard if |enabled|, else destroys it.
   void SetKeyboardEnabled(bool enabled);
 
+  void MoveKeyboardToFirstTouchableDisplay() const;
+
   // True if an external keyboard is connected.
   bool has_external_keyboard_;
   // True if an internal keyboard is connected.
   bool has_internal_keyboard_;
   // True if a touchscreen is connected.
   bool has_touchscreen_;
   // True if the presense of an external keyboard should be ignored.
   bool ignore_external_keyboard_;
 
   DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_