Smooth scroll on Windows should respect OS level animation disabling

content/renderer/input/input_handler_wrapper.cc

 // Copyright 2013 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/input/input_handler_wrapper.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "content/common/input/did_overscroll_params.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/input/input_event_filter.h"
 #include "content/renderer/input/input_handler_manager.h"
 #include "third_party/WebKit/public/platform/Platform.h"
 
 namespace content {
 
 InputHandlerWrapper::InputHandlerWrapper(
     InputHandlerManager* input_handler_manager,
     int routing_id,
     const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
     const base::WeakPtr<cc::InputHandler>& input_handler,
-    const base::WeakPtr<RenderViewImpl>& render_view_impl)
+    const base::WeakPtr<RenderViewImpl>& render_view_impl,
+    bool enable_smooth_scrolling)
     : input_handler_manager_(input_handler_manager),
       routing_id_(routing_id),
       input_handler_proxy_(input_handler.get(), this),
       main_task_runner_(main_task_runner),
       render_view_impl_(render_view_impl) {
   DCHECK(input_handler);
-  input_handler_proxy_.set_smooth_scroll_enabled(
-      !base::CommandLine::ForCurrentProcess()->HasSwitch(
-                  switches::kDisableSmoothScrolling));
+  input_handler_proxy_.set_smooth_scroll_enabled(enable_smooth_scrolling);
 }
 
 InputHandlerWrapper::~InputHandlerWrapper() {
 }
 
 void InputHandlerWrapper::TransferActiveWheelFlingAnimation(
     const blink::WebActiveWheelFlingParameters& params) {
   main_task_runner_->PostTask(
       FROM_HERE, base::Bind(&RenderViewImpl::TransferActiveWheelFlingAnimation,
                             render_view_impl_, params));
@@ skipping 26 matching lines @@
 
 void InputHandlerWrapper::DidStopFlinging() {
   input_handler_manager_->DidStopFlinging(routing_id_);
 }
 
 void InputHandlerWrapper::DidAnimateForInput() {
   input_handler_manager_->DidAnimateForInput();
 }
 
 }  // namespace content