Add API to event_sender.

content/shell/renderer/test_runner/event_sender.h

Index: content/shell/renderer/test_runner/event_sender.h
diff --git a/content/shell/renderer/test_runner/event_sender.h b/content/shell/renderer/test_runner/event_sender.h
index 3b2c7efc3af0bdc716d3286e9e3e1f5bb37b18c4..350155742c0fea815a5771385adef28da7e78ad8 100644
--- a/content/shell/renderer/test_runner/event_sender.h
+++ b/content/shell/renderer/test_runner/event_sender.h
@@ -128,7 +128,6 @@ class EventSender : public base::SupportsWeakPtr<EventSender> {
 
   void MouseDragBegin();
   void MouseDragEnd();
-  void MouseMomentumBegin();
 
   void GestureScrollBegin(gin::Arguments* args);
   void GestureScrollEnd(gin::Arguments* args);
@@ -144,7 +143,12 @@ class EventSender : public base::SupportsWeakPtr<EventSender> {
 
   void ContinuousMouseScrollBy(gin::Arguments* args);
   void MouseMoveTo(gin::Arguments* args);
+  void TrackpadScrollBegin();
+  void TrackpadScroll(gin::Arguments* args);
+  void TrackpadScrollEnd();
   void MouseScrollBy(gin::Arguments* args);
+  void MouseMomentumBegin();
+  void MouseMomentumBegin2(gin::Arguments* args);
   void MouseMomentumScrollBy(gin::Arguments* args);
   void MouseMomentumEnd();
   void ScheduleAsynchronousClick(int button_number, int modifiers);