Handle Ctrl+Mousewheel after renderer

content/browser/renderer_host/input/input_router_impl.cc

Index: content/browser/renderer_host/input/input_router_impl.cc
diff --git a/content/browser/renderer_host/input/input_router_impl.cc b/content/browser/renderer_host/input/input_router_impl.cc
index e4b4d82ee88c70386cb05acdd3b69a36e78e6a37..60acbd9fa8f67c9014226378a17c1a69513d1263 100644
--- a/content/browser/renderer_host/input/input_router_impl.cc
+++ b/content/browser/renderer_host/input/input_router_impl.cc
@@ -424,6 +424,13 @@ void InputRouterImpl::OfferToHandlers(const WebInputEvent& input_event,
 bool InputRouterImpl::OfferToOverscrollController(
     const WebInputEvent& input_event,
     const ui::LatencyInfo& latency_info) {
+#if !defined(OS_MACOSX)
+  // Ctrl + mousewheel is reserved for zooming on every platform except for Mac.
+  if (input_event.type == WebInputEvent::MouseWheel &&
+      input_event.modifiers & WebInputEvent::ControlKey)
+    return false;
+#endif
+
   OverscrollController* controller = client_->GetOverscrollController();
   if (!controller)
     return false;
@@ -630,7 +637,14 @@ void InputRouterImpl::ProcessMouseAck(blink::WebInputEvent::Type type,
 
 void InputRouterImpl::ProcessWheelAck(InputEventAckState ack_result,
                                       const ui::LatencyInfo& latency) {
+#if defined(OS_MACOSX)
   ProcessAckForOverscroll(current_wheel_event_.event, ack_result);
+#else
+  // Ctrl + mousewheel is reserved for zooming on every platform except for Mac.
+  if (!(current_wheel_event_.event.modifiers & WebInputEvent::ControlKey)) {
+    ProcessAckForOverscroll(current_wheel_event_.event, ack_result);
+  }
+#endif
 
   // TODO(miletus): Add renderer side latency to each uncoalesced mouse
   // wheel event and add terminal component to each of them.