Synthesize ctrl-wheel events on touchpad pinch

content/common/input/synthetic_web_input_event_builders.h

Index: content/common/input/synthetic_web_input_event_builders.h
diff --git a/content/common/input/synthetic_web_input_event_builders.h b/content/common/input/synthetic_web_input_event_builders.h
index 5df4cd6109aa7809a0d7c8b74135fb30fee5c637..416cb117bc2d702fda33dd4ae03276a22d933ea9 100644
--- a/content/common/input/synthetic_web_input_event_builders.h
+++ b/content/common/input/synthetic_web_input_event_builders.h
@@ -47,10 +47,12 @@ class CONTENT_EXPORT SyntheticWebGestureEventBuilder {
   static blink::WebGestureEvent BuildScrollUpdate(float dx,
                                                   float dy,
                                                   int modifiers);
-  static blink::WebGestureEvent BuildPinchUpdate(float scale,
-                                                 float anchor_x,
-                                                 float anchor_y,
-                                                 int modifiers);
+  static blink::WebGestureEvent BuildPinchUpdate(
+      float scale,
+      float anchor_x,
+      float anchor_y,
+      int modifiers,
+      blink::WebGestureEvent::SourceDevice sourceDevice);
   static blink::WebGestureEvent BuildFling(
       float velocity_x,
       float velocity_y,