Move middle-click autoscroll to synthetic fling.

third_party/WebKit/Source/core/input/ScrollManager.cpp

 // Copyright 2016 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 "core/input/ScrollManager.h"
 
 #include <memory>
 #include "core/dom/DOMNodeIds.h"
 #include "core/events/GestureEvent.h"
 #include "core/frame/BrowserControls.h"
@@ skipping 49 matching lines @@
     bool reset_y = true;
     page->GetOverscrollController().ResetAccumulated(reset_x, reset_y);
   }
 }
 
 void ScrollManager::StopAutoscroll() {
   if (AutoscrollController* controller = GetAutoscrollController())
     controller->StopAutoscroll();
 }
 
+void ScrollManager::StopMiddleClickAutoscroll() {
+  if (AutoscrollController* controller = GetAutoscrollController())
+    controller->StopMiddleClickAutoscroll(frame_);
+}
+
 bool ScrollManager::MiddleClickAutoscrollInProgress() const {
   return GetAutoscrollController() &&
          GetAutoscrollController()->MiddleClickAutoscrollInProgress();
 }
 
 AutoscrollController* ScrollManager::GetAutoscrollController() const {
   if (Page* page = frame_->GetPage())
     return &page->GetAutoscrollController();
   return nullptr;
 }
@@ skipping 576 matching lines @@
                                 &should_update_capture)) {
       if (should_update_capture)
         scrollbar_handling_scroll_gesture_ = scrollbar;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace blink