Route Scroll events through a cc::InputHandler

ui/views/controls/scrollbar/base_scroll_bar.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 "ui/views/controls/scrollbar/base_scroll_bar.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 159 matching lines @@
     return true;
   }
   return false;
 }
 
 bool BaseScrollBar::OnMouseWheel(const ui::MouseWheelEvent& event) {
   OnScroll(event.x_offset(), event.y_offset());
   return true;
 }
 
+void BaseScrollBar::OnScrollEvent(ui::ScrollEvent* event) {
+  controller()->OnScrollEventFromScrollBar(event);
+}
+
 void BaseScrollBar::OnGestureEvent(ui::GestureEvent* event) {
   // If a fling is in progress, then stop the fling for any incoming gesture
   // event (except for the GESTURE_END event that is generated at the end of the
   // fling).
   if (scroll_animator_.get() && scroll_animator_->is_scrolling() &&
       (event->type() != ui::ET_GESTURE_END ||
        event->details().touch_points() > 1)) {
     scroll_animator_->Stop();
   }
 
@@ skipping 290 matching lines @@
   int track_size = GetTrackSize();
   if (track_size == thumb_size)
     return 0;
   if (scroll_to_middle)
     thumb_position = thumb_position - (thumb_size / 2);
   return (thumb_position * (contents_size_ - viewport_size_)) /
          (track_size - thumb_size);
 }
 
 }  // namespace views