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

ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

 // 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.
 
 #include "ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.h"
 
 #include <algorithm>
 
 #include "ash/common/keyboard/keyboard_ui.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
+#include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/wm_shell.h"
+#include "ash/common/wm_window.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
+#include "ui/display/display.h"
 #include "ui/events/event.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 #include "ui/keyboard/keyboard_controller.h"
 #include "ui/views/controls/image_view.h"
 
 namespace ash {
 
 VirtualKeyboardTray::VirtualKeyboardTray(WmShelf* wm_shelf)
-    : TrayBackgroundView(wm_shelf), icon_(new views::ImageView) {
+    : TrayBackgroundView(wm_shelf),
+      display_id_(wm_shelf->GetWindow()->GetDisplayNearestWindow().id()),

[oshima, 2016/11/08 17:26:04]

This mapping may change. Please get this when showing the keyboard.

[yhanada, 2016/11/14 22:48:47]

Done.

+      icon_(new views::ImageView) {
   if (MaterialDesignController::IsShelfMaterial()) {
     gfx::ImageSkia image_md =
         CreateVectorIcon(gfx::VectorIconId::SHELF_KEYBOARD, kShelfIconColor);
     icon_->SetImage(image_md);
   } else {
     gfx::ImageSkia* image_non_md =
         ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
             IDR_AURA_UBER_TRAY_VIRTUAL_KEYBOARD);
     icon_->SetImage(image_non_md);
   }
@@ skipping 28 matching lines @@
   return l10n_util::GetStringUTF16(
       IDS_ASH_VIRTUAL_KEYBOARD_TRAY_ACCESSIBLE_NAME);
 }
 
 void VirtualKeyboardTray::HideBubbleWithView(
     const views::TrayBubbleView* bubble_view) {}
 
 void VirtualKeyboardTray::ClickedOutsideBubble() {}
 
 bool VirtualKeyboardTray::PerformAction(const ui::Event& event) {
-  WmShell::Get()->keyboard_ui()->Show();
+  WmShell::Get()->keyboard_ui()->ShowInSpecificDisplay(display_id_);
   return true;
 }
 
 void VirtualKeyboardTray::OnKeyboardEnabledStateChanged(bool new_enabled) {
   SetVisible(new_enabled);
   if (new_enabled) {
     // Observe keyboard controller to detect when the virtual keyboard is
     // shown/hidden.
     ObserveKeyboardController();
   } else {
@@ skipping 37 matching lines @@
 }
 
 void VirtualKeyboardTray::UnobserveKeyboardController() {
   keyboard::KeyboardController* keyboard_controller =
       keyboard::KeyboardController::GetInstance();
   if (keyboard_controller)
     keyboard_controller->RemoveObserver(this);
 }
 
 }  // namespace ash