Adds special support to the device manager for keyboards devices.

ash/display/display_change_observer_chromeos.cc

 // Copyright 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 "ash/display/display_change_observer_chromeos.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
+#include <string>
+#include <utility>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "ash/touch/touchscreen_util.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 246 matching lines @@
 
 // static
 float DisplayChangeObserver::FindDeviceScaleFactor(float dpi) {
   for (size_t i = 0; i < arraysize(kThresholdTable); ++i) {
     if (dpi > kThresholdTable[i].dpi)
       return kThresholdTable[i].device_scale_factor;
   }
   return 1.0f;
 }
 
-void DisplayChangeObserver::OnInputDeviceConfigurationChanged() {
+void DisplayChangeObserver::OnTouchscreenDeviceConfigurationChanged() {
   std::vector<DisplayInfo> display_infos;
   DisplayManager* display_manager =
       ash::Shell::GetInstance()->display_manager();
   const std::vector<gfx::Display>& displays = display_manager->displays();
   // Reuse the current state in DisplayManager and re-associate the displays
   // with the touchscreens.
   for (size_t i = 0; i < displays.size(); ++i) {
     DisplayInfo display = display_manager->GetDisplayInfo(displays[i].id());
     // Unset the touchscreen configuration since we'll be rematching them from
     // scratch.
     display.set_touch_device_id(ui::TouchscreenDevice::kInvalidId);
     display.set_touch_support(gfx::Display::TOUCH_SUPPORT_UNKNOWN);
 
     display_infos.push_back(display);
   }
 
   AssociateTouchscreens(
       &display_infos,
       ui::DeviceDataManager::GetInstance()->touchscreen_devices());
   display_manager->OnNativeDisplaysChanged(display_infos);
 }
 
+void DisplayChangeObserver::OnKeyboardDeviceConfigurationChanged() {}
+
 }  // namespace ash