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

content/browser/renderer_host/input/touch_selection_controller_client_aura.cc

 // Copyright 2015 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/input/touch_selection_controller_client_aura.h"
 
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 #include "content/common/view_messages.h"
@@ skipping 124 matching lines @@
   touch_down_ = true;
   UpdateQuickMenu();
 }
 
 void TouchSelectionControllerClientAura::OnTouchUp() {
   touch_down_ = false;
   UpdateQuickMenu();
 }
 
 void TouchSelectionControllerClientAura::OnScrollStarted() {
+  rwhva_->selection_controller()->OnScrollBeginEvent();
   scroll_in_progress_ = true;
   rwhva_->selection_controller()->SetTemporarilyHidden(true);
   UpdateQuickMenu();
 }
 
 void TouchSelectionControllerClientAura::OnScrollCompleted() {
   scroll_in_progress_ = false;
   rwhva_->selection_controller()->SetTemporarilyHidden(false);
   UpdateQuickMenu();
 }
@@ skipping 211 matching lines @@
                                          ui::MENU_SOURCE_TOUCH_EDIT_MENU,
                                          gfx::ToRoundedPoint(anchor_point)));
 
   // Hide selection handles after getting rect-between-bounds from touch
   // selection controller; otherwise, rect would be empty and the above
   // calculations would be invalid.
   rwhva_->selection_controller()->HideAndDisallowShowingAutomatically();
 }
 
 }  // namespace content