views: Mark a tap-down as handled only if scrolling was actually stopped.

ui/views/controls/menu/submenu_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.
 
 #include "ui/views/controls/menu/submenu_view.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "ui/base/accessibility/accessible_view_state.h"
@@ skipping 263 matching lines @@
       handled = OnScroll(0, event->details().scroll_y());
       break;
     case ui::ET_GESTURE_SCROLL_END:
       break;
     case ui::ET_SCROLL_FLING_START:
       if (event->details().velocity_y() != 0.0f)
         scroll_animator_->Start(0, event->details().velocity_y());
       break;
     case ui::ET_GESTURE_TAP_DOWN:
     case ui::ET_SCROLL_FLING_CANCEL:
-      scroll_animator_->Stop();
+      if (scroll_animator_->is_scrolling())
+        scroll_animator_->Stop();
+      else
+        handled = false;
       break;
     default:
       handled = false;
       break;
   }
   if (handled)
     event->SetHandled();
 }
 
 bool SubmenuView::IsShowing() {
@@ skipping 161 matching lines @@
   y = std::max(y, 0);
   gfx::Rect new_vis_bounds(x, y, vis_bounds.width(), vis_bounds.height());
   if (new_vis_bounds != vis_bounds) {
     ScrollRectToVisible(new_vis_bounds);
     return true;
   }
   return false;
 }
 
 }  // namespace views