Forward GenericMotionEvent to EventForwarder

ui/android/event_forwarder.h

Index: ui/android/event_forwarder.h
diff --git a/ui/android/event_forwarder.h b/ui/android/event_forwarder.h
index 9d9c2c0f9b4ed1cf9597226da1df60d62c1aee53..480ec265538f55ca4bb60cf5151671b47cc5b3ec 100644
--- a/ui/android/event_forwarder.h
+++ b/ui/android/event_forwarder.h
@@ -61,6 +61,15 @@ class EventForwarder {
                     jint android_meta_state,
                     jint tool_type);
 
+  void OnMouseWheelEvent(JNIEnv* env,
+                         const base::android::JavaParamRef<jobject>& obj,
+                         jlong time_ms,
+                         jfloat x,
+                         jfloat y,
+                         jfloat ticks_x,
+                         jfloat ticks_y,
+                         jfloat pixels_per_tick);
+
  private:
   friend class ViewAndroid;