Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All
  * Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 43 matching lines @@
 #include "core/page/ValidationMessageClient.h"
 #include "core/page/scrolling/OverscrollController.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/page/scrolling/TopDocumentRootScrollerController.h"
 #include "core/paint/PaintLayer.h"
 #include "core/probe/CoreProbes.h"
 #include "platform/WebFrameScheduler.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/loader/fetch/ResourceFetcher.h"
 #include "platform/plugins/PluginData.h"
+#include "platform/scroll/SmoothScrollSequencer.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 // Set of all live pages; includes internal Page objects that are
 // not observable from scripts.
 static Page::PageSet& AllPages() {
   DEFINE_STATIC_LOCAL(Page::PageSet, pages, ());
   return pages;
 }
@@ skipping 90 matching lines @@
   if (!scrolling_coordinator_ && settings_->GetAcceleratedCompositingEnabled())
     scrolling_coordinator_ = ScrollingCoordinator::Create(this);
 
   return scrolling_coordinator_.Get();
 }
 
 PageScaleConstraintsSet& Page::GetPageScaleConstraintsSet() {
   return *page_scale_constraints_set_;
 }
 
+SmoothScrollSequencer* Page::GetSmoothScrollSequencer() {
+  if (!smooth_scroll_sequencer_)
+    smooth_scroll_sequencer_ = SmoothScrollSequencer::Create();

[bokan, 2017/05/19 18:37:14]

Since we're using this for more than just smooth scrollIntoViews now, lets just
create it in the constructor rather than lazily.

[sunyunjia, 2017/05/19 22:30:41]

Done.

+
+  return smooth_scroll_sequencer_.Get();
+}
+
 const PageScaleConstraintsSet& Page::GetPageScaleConstraintsSet() const {
   return *page_scale_constraints_set_;
 }
 
 BrowserControls& Page::GetBrowserControls() {
   return *browser_controls_;
 }
 
 const BrowserControls& Page::GetBrowserControls() const {
   return *browser_controls_;
@@ skipping 430 matching lines @@
 DEFINE_TRACE(Page) {
   visitor->Trace(animator_);
   visitor->Trace(autoscroll_controller_);
   visitor->Trace(chrome_client_);
   visitor->Trace(drag_caret_);
   visitor->Trace(drag_controller_);
   visitor->Trace(focus_controller_);
   visitor->Trace(context_menu_controller_);
   visitor->Trace(pointer_lock_controller_);
   visitor->Trace(scrolling_coordinator_);
+  visitor->Trace(smooth_scroll_sequencer_);
   visitor->Trace(browser_controls_);
   visitor->Trace(console_message_storage_);
   visitor->Trace(event_handler_registry_);
   visitor->Trace(global_root_scroller_controller_);
   visitor->Trace(visual_viewport_);
   visitor->Trace(overscroll_controller_);
   visitor->Trace(main_frame_);
   visitor->Trace(validation_message_client_);
   visitor->Trace(use_counter_);
   Supplementable<Page>::Trace(visitor);
@@ skipping 39 matching lines @@
     : chrome_client(nullptr),
       context_menu_client(nullptr),
       editor_client(nullptr),
       spell_checker_client(nullptr) {}
 
 Page::PageClients::~PageClients() {}
 
 template class CORE_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink