MD Settings: Add mouse settings, update pointer settings

chrome/browser/chromeos/system/input_device_settings.h

Index: chrome/browser/chromeos/system/input_device_settings.h
diff --git a/chrome/browser/chromeos/system/input_device_settings.h b/chrome/browser/chromeos/system/input_device_settings.h
index 4c4895c706cd13bf2c1839f4c91c052f693c7523..8f9f529e35dcdf6a4d68e4ccbe627583a2afd1d8 100644
--- a/chrome/browser/chromeos/system/input_device_settings.h
+++ b/chrome/browser/chromeos/system/input_device_settings.h
@@ -169,6 +169,9 @@ class CHROMEOS_EXPORT InputDeviceSettings {
   // NULL to this method.
   static void SetSettingsForTesting(FakeInputDeviceSettings* test_settings);
 
+  // Returns true if the current instance was passed to SetSettingsForTesting.
+  static bool DidSetSettingsForTesting();
+
   // Returns true if UI should implement enhanced keyboard support for cases
   // where other input devices like mouse are absent.
   static bool ForceKeyboardDrivenUINavigation();