Revert of Remove enable/disable wheel gestures setting.

content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc

Index: content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc
diff --git a/content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc b/content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc
index ace5eb4cb62cd01b19ee5d816fb2709124cb0bf2..e799eeb8b063c51a6d2524ed9961386da282464b 100644
--- a/content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc
+++ b/content/browser/renderer_host/input/mouse_wheel_event_queue_unittest.cc
@@ -145,7 +145,7 @@
   MouseWheelEventQueueTest()
       : acked_event_count_(0),
         last_acked_event_state_(INPUT_EVENT_ACK_STATE_UNKNOWN) {
-    queue_.reset(new MouseWheelEventQueue(this, kScrollEndTimeoutMs));
+    SetUpForGestureTesting(false);
   }
 
   ~MouseWheelEventQueueTest() override {}
@@ -176,6 +176,11 @@
   }
 
  protected:
+  void SetUpForGestureTesting(bool send_gestures) {
+    queue_.reset(
+        new MouseWheelEventQueue(this, send_gestures, kScrollEndTimeoutMs));
+  }
+
   size_t queued_event_count() const { return queue_->queued_size(); }
 
   bool event_in_flight() const { return queue_->event_in_flight(); }
@@ -430,23 +435,28 @@
 }
 
 TEST_F(MouseWheelEventQueueTest, GestureSending) {
+  SetUpForGestureTesting(true);
   GestureSendingTest(false);
 }
 
 TEST_F(MouseWheelEventQueueTest, GestureSendingPrecisePixels) {
+  SetUpForGestureTesting(true);
   GestureSendingTest(false);
 }
 
 TEST_F(MouseWheelEventQueueTest, GestureSendingWithPhaseInformation) {
+  SetUpForGestureTesting(true);
   PhaseGestureSendingTest(false);
 }
 
 TEST_F(MouseWheelEventQueueTest,
        GestureSendingWithPhaseInformationPrecisePixels) {
+  SetUpForGestureTesting(true);
   PhaseGestureSendingTest(true);
 }
 
 TEST_F(MouseWheelEventQueueTest, GestureSendingInterrupted) {
+  SetUpForGestureTesting(true);
   const WebGestureEvent::ScrollUnits scroll_units = WebGestureEvent::Pixels;
 
   SendMouseWheel(kWheelScrollX, kWheelScrollY, kWheelScrollGlobalX,
@@ -509,6 +519,7 @@
 }
 
 TEST_F(MouseWheelEventQueueTest, GestureRailScrolling) {
+  SetUpForGestureTesting(true);
   const WebGestureEvent::ScrollUnits scroll_units = WebGestureEvent::Pixels;
 
   SendMouseWheel(kWheelScrollX, kWheelScrollY, kWheelScrollGlobalX,