Explicitly suppress scrolling for wheel events that will trigger zooming

content/common/input/synthetic_web_input_event_builders.cc

Index: content/common/input/synthetic_web_input_event_builders.cc
diff --git a/content/common/input/synthetic_web_input_event_builders.cc b/content/common/input/synthetic_web_input_event_builders.cc
index 563a93b038bc9f5c5aa6ed914759efdf442241fd..675df618d8ddbd5e2db690cdbde2a397b3dfa4f8 100644
--- a/content/common/input/synthetic_web_input_event_builders.cc
+++ b/content/common/input/synthetic_web_input_event_builders.cc
@@ -68,6 +68,7 @@ WebMouseWheelEvent SyntheticWebMouseWheelEventBuilder::Build(float dx,
     result.wheelTicksY = dy > 0.0f ? 1.0f : -1.0f;
   result.modifiers = modifiers;
   result.hasPreciseScrollingDeltas = precise;
+  result.canScroll = true;
   return result;
 }