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

chrome/browser/chromeos/system/fake_input_device_settings.cc

Index: chrome/browser/chromeos/system/fake_input_device_settings.cc
diff --git a/chrome/browser/chromeos/system/fake_input_device_settings.cc b/chrome/browser/chromeos/system/fake_input_device_settings.cc
index d673c19bf3c30fa345f636257227c005b800877b..8369f42e0ffbe19b17aeac627096c45dd52d8f7a 100644
--- a/chrome/browser/chromeos/system/fake_input_device_settings.cc
+++ b/chrome/browser/chromeos/system/fake_input_device_settings.cc
@@ -7,14 +7,15 @@
 namespace chromeos {
 namespace system {
 
-FakeInputDeviceSettings::FakeInputDeviceSettings() {}
+FakeInputDeviceSettings::FakeInputDeviceSettings()
+    : mouse_exists_(true), touchpad_exists_(true) {}
 
 FakeInputDeviceSettings::~FakeInputDeviceSettings() {}
 
 // Overriden from InputDeviceSettings.
 void FakeInputDeviceSettings::TouchpadExists(
     const DeviceExistsCallback& callback) {
-  callback.Run(true);
+  callback.Run(touchpad_exists_);
 }
 
 void FakeInputDeviceSettings::UpdateTouchpadSettings(
@@ -54,7 +55,7 @@ void FakeInputDeviceSettings::SetNaturalScroll(bool enabled) {
 
 void FakeInputDeviceSettings::MouseExists(
     const DeviceExistsCallback& callback) {
-  callback.Run(false);
+  callback.Run(mouse_exists_);
 }
 
 void FakeInputDeviceSettings::UpdateMouseSettings(
@@ -80,5 +81,13 @@ 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