Adding momentum/overscroll to views:: ScrollViews

ui/views/view.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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 1337 matching lines @@
 void View::ScrollRectToVisible(const gfx::Rect& rect) {
   // We must take RTL UI mirroring into account when adjusting the position of
   // the region.
   if (parent_) {
     gfx::Rect scroll_rect(rect);
     scroll_rect.Offset(GetMirroredX(), y());
     parent_->ScrollRectToVisible(scroll_rect);
   }
 }
 
+ScrollView* View::EnclosingScrollView() {
+  return parent() ? parent()->EnclosingScrollView() : nullptr;
+}
+
 int View::GetPageScrollIncrement(ScrollView* scroll_view,
                                  bool is_horizontal, bool is_positive) {
   return 0;
 }
 
 int View::GetLineScrollIncrement(ScrollView* scroll_view,
                                  bool is_horizontal, bool is_positive) {
   return 0;
 }
 
@@ skipping 1052 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views