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

ash/common/keyboard/keyboard_ui.cc

 // Copyright 2016 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 "ash/common/keyboard/keyboard_ui.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/keyboard/keyboard_ui_observer.h"
 #include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
@@ skipping 12 matching lines @@
 
   ~KeyboardUIImpl() override {
     if (WmShell::HasInstance() && WmShell::Get()->system_tray_notifier())
       WmShell::Get()->system_tray_notifier()->RemoveAccessibilityObserver(this);
   }
 
   // KeyboardUI:
   void Show() override {
     keyboard::KeyboardController::GetInstance()->ShowKeyboard(true);
   }
+  void ShowInDisplay(int64_t display_id) override {
+    keyboard::KeyboardController::GetInstance()->ShowKeyboardInDisplay(
+        display_id);
+  }
   void Hide() override {
     // Do nothing as this is called from ash::Shell, which also calls through
     // to the appropriate keyboard functions.
   }
   bool IsEnabled() override {
     return WmShell::Get()->accessibility_delegate()->IsVirtualKeyboardEnabled();
   }
 
   // AccessibilityObserver:
   void OnAccessibilityModeChanged(
@@ skipping 24 matching lines @@
   observers_.AddObserver(observer);
 }
 
 void KeyboardUI::RemoveObserver(KeyboardUIObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 KeyboardUI::KeyboardUI() {}
 
 }  // namespace ash