Revert of Remove enable/disable wheel gestures setting.

components/test_runner/web_test_proxy.cc

Index: components/test_runner/web_test_proxy.cc
diff --git a/components/test_runner/web_test_proxy.cc b/components/test_runner/web_test_proxy.cc
index 299a45a162ce344089ea34d863469b6f08b58ccf..8e4ad2046c503a1c514cf0f1b798c08c72cef7e5 100644
--- a/components/test_runner/web_test_proxy.cc
+++ b/components/test_runner/web_test_proxy.cc
@@ -38,6 +38,10 @@
   test_interfaces_->WindowOpened(this);
 }
 
+void WebTestProxyBase::SetSendWheelGestures(bool send_gestures) {
+  event_sender_->set_send_wheel_gestures(send_gestures);
+}
+
 void WebTestProxyBase::Reset() {
   accessibility_controller_->Reset();
   event_sender_->Reset();