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

chrome/browser/ui/ash/chrome_keyboard_ui.cc

 // Copyright (c) 2013 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/ui/ash/chrome_keyboard_ui.h"
 
 #include <utility>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
@@ skipping 172 matching lines @@
     content::RenderViewHost* render_view_host) {
   content::HostZoomMap* zoom_map =
       content::HostZoomMap::GetDefaultForBrowserContext(browser_context());
   DCHECK(zoom_map);
   int render_process_id = render_view_host->GetProcess()->GetID();
   int render_view_id = render_view_host->GetRoutingID();
   zoom_map->SetTemporaryZoomLevel(render_process_id, render_view_id, 0);
 }
 
 void ChromeKeyboardUI::ShowKeyboardContainer(aura::Window* container) {
-  // TODO(bshe): Implement logic to decide which root window should display
-  // virtual keyboard. http://crbug.com/303429
-  if (container->GetRootWindow() != ash::Shell::GetPrimaryRootWindow())
-    NOTIMPLEMENTED();
-
   KeyboardUIContent::ShowKeyboardContainer(container);
 }
 
 bool ChromeKeyboardUI::ShouldWindowOverscroll(aura::Window* window) const {
   aura::Window* root_window = window->GetRootWindow();
   if (!root_window)
     return true;
 
   if (root_window != GetKeyboardRootWindow())
     return false;
@@ skipping 28 matching lines @@
   event_args->Append(std::move(input_context));
 
   std::unique_ptr<extensions::Event> event(new extensions::Event(
       extensions::events::VIRTUAL_KEYBOARD_PRIVATE_ON_TEXT_INPUT_BOX_FOCUSED,
       virtual_keyboard_private::OnTextInputBoxFocused::kEventName,
       std::move(event_args)));
   event->restrict_to_browser_context = browser_context();
   router->DispatchEventToExtension(kVirtualKeyboardExtensionID,
                                    std::move(event));
 }