Expose native, desktop and mobile gesture detection defaults

ui/events/gesture_detection/gesture_provider_config_helper.h

Index: ui/events/gesture_detection/gesture_provider_config_helper.h
diff --git a/ui/events/gesture_detection/gesture_provider_config_helper.h b/ui/events/gesture_detection/gesture_provider_config_helper.h
index 8e5a4f2372cc23c91768346ffaa4a0659f853002..bfbe2182234391bed4d1d21f04326d57d0990ec0 100644
--- a/ui/events/gesture_detection/gesture_provider_config_helper.h
+++ b/ui/events/gesture_detection/gesture_provider_config_helper.h
@@ -12,7 +12,14 @@
 
 namespace ui {
 
-GESTURE_DETECTION_EXPORT GestureProvider::Config DefaultGestureProviderConfig();
+enum class GestureProviderConfigType {
+  CURRENT_PLATFORM,  // Parameters tailored for the current platform.
+  GENERIC_DESKTOP,   // Parameters typical for a desktop machine.
+  GENERIC_MOBILE     // Parameters typical for a mobile device (phone/tablet).
+};
+
+GESTURE_DETECTION_EXPORT GestureProvider::Config GetGestureProviderConfig(
+    GestureProviderConfigType);
 
 }  // namespace ui