Allow scrolling a page with selection after long-press on whitespace

content/browser/renderer_host/render_widget_host_view_aura.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2904 matching lines @@
         event->SetHandled();
       }
       break;
     case ui::ET_GESTURE_TAP:
       if (selection_controller_->WillHandleTapEvent(
               event->location_f(), event->details().tap_count())) {
         event->SetHandled();
       }
       break;
     case ui::ET_GESTURE_SCROLL_BEGIN:
+      selection_controller_->OnScrollBeginEvent();
       selection_controller_client_->OnScrollStarted();
       break;
     case ui::ET_GESTURE_SCROLL_END:
       selection_controller_client_->OnScrollCompleted();
       break;
     default:
       break;
   }
 }
 
@@ skipping 84 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content