Use fake Input Device Settings with chrome://device-emulator

chrome/browser/chromeos/system/fake_input_device_settings.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 "chrome/browser/chromeos/system/fake_input_device_settings.h"
 
 namespace chromeos {
 namespace system {
 
-FakeInputDeviceSettings::FakeInputDeviceSettings() {}
+FakeInputDeviceSettings::FakeInputDeviceSettings()
+    : mouse_exists_(true), touchpad_exists_(true) {}

[stevenjb, 2016/06/30 00:17:30]

nit: initialize in header

[michaelpg, 2016/07/01 22:01:48]

Done.

 
 FakeInputDeviceSettings::~FakeInputDeviceSettings() {}
 
 // Overriden from InputDeviceSettings.
 void FakeInputDeviceSettings::TouchpadExists(
     const DeviceExistsCallback& callback) {
-  callback.Run(true);
+  callback.Run(touchpad_exists_);
 }
 
 void FakeInputDeviceSettings::UpdateTouchpadSettings(
     const TouchpadSettings& settings) {
   current_touchpad_settings_.Update(settings);
 }
 
 void FakeInputDeviceSettings::SetTouchpadSensitivity(int value) {
   TouchpadSettings settings;
   settings.SetSensitivity(value);
@@ skipping 19 matching lines @@
 }
 
 void FakeInputDeviceSettings::SetNaturalScroll(bool enabled) {
   TouchpadSettings settings;
   settings.SetNaturalScroll(enabled);
   UpdateTouchpadSettings(settings);
 }
 
 void FakeInputDeviceSettings::MouseExists(
     const DeviceExistsCallback& callback) {
-  callback.Run(false);
+  callback.Run(mouse_exists_);
 }
 
 void FakeInputDeviceSettings::UpdateMouseSettings(
     const MouseSettings& settings) {
   current_mouse_settings_.Update(settings);
 }
 
 void FakeInputDeviceSettings::SetMouseSensitivity(int value) {
   MouseSettings settings;
   settings.SetSensitivity(value);
   UpdateMouseSettings(settings);
 }
 
 void FakeInputDeviceSettings::SetPrimaryButtonRight(bool right) {
   MouseSettings settings;
   settings.SetPrimaryButtonRight(right);
   UpdateMouseSettings(settings);
 }
 
 void FakeInputDeviceSettings::ReapplyTouchpadSettings() {
 }
 
 void FakeInputDeviceSettings::ReapplyMouseSettings() {
 }
 
+void FakeInputDeviceSettings::SetMouseExists(bool exists) {
+  mouse_exists_ = exists;
+}
+
+void FakeInputDeviceSettings::SetTouchpadExists(bool exists) {
+  touchpad_exists_ = exists;
+}
+
 }  // namespace system
 }  // namespace chromeos