Plumb firing passive event listeners.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 2121 matching lines @@
       routing_id(), text_input_type != blink::WebTextInputTypeNone));
 #endif
 }
 
 void RenderViewImpl::initializeLayerTreeView() {
   RenderWidget::initializeLayerTreeView();
   RenderWidgetCompositor* rwc = compositor();
   if (!rwc)
     return;
 
+  bool enable_wheel_gestures =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableWheelGestures);
+
   bool use_threaded_event_handling = true;
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   // Disable threaded event handling if content is not handling the elastic
   // overscroll effect. This includes the cases where the elastic overscroll
   // effect is being handled by Blink (because of command line flags) and older
   // operating system versions which do not have an elastic overscroll effect
   // (SnowLeopard, which has Aqua scrollbars which need synchronous updates).
   use_threaded_event_handling = compositor_deps_->IsElasticOverscrollEnabled();
 #endif
   if (use_threaded_event_handling) {
     RenderThreadImpl* render_thread = RenderThreadImpl::current();
     // render_thread may be NULL in tests.
     InputHandlerManager* input_handler_manager =
         render_thread ? render_thread->input_handler_manager() : NULL;
     if (input_handler_manager) {
       input_handler_manager->AddInputHandler(
           routing_id(), rwc->GetInputHandler(), AsWeakPtr(),
-          webkit_preferences_.enable_scroll_animator);
+          webkit_preferences_.enable_scroll_animator, enable_wheel_gestures);
     }
   }
 }
 
 // blink::WebFrameClient -----------------------------------------------------
 
 void RenderViewImpl::Repaint(const gfx::Size& size) {
   OnRepaint(size);
 }
 
@@ skipping 1362 matching lines @@
   if (IsUseZoomForDSFEnabled()) {
     webview()->setZoomFactorForDeviceScaleFactor(device_scale_factor_);
   } else {
     webview()->setDeviceScaleFactor(device_scale_factor_);
   }
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
 }
 
 }  // namespace content