Move logic of recording main thread scrolling reasons from cc to blink::ScrollManager

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 192 matching lines @@
       subtree_throttled_(false),
       lifecycle_updates_throttled_(false),
       needs_paint_property_update_(true),
       current_update_lifecycle_phases_target_state_(
           DocumentLifecycle::kUninitialized),
       scroll_anchor_(this),
       scrollbar_manager_(*this),
       needs_scrollbars_update_(false),
       suppress_adjust_view_size_(false),
       allows_layout_invalidation_after_layout_clean_(true),
-      main_thread_scrolling_reasons_(0),
-      main_thread_scrolling_reasons_counter_(
-          MainThreadScrollingReason::kMainThreadScrollingReasonCount,
-          0) {
+      main_thread_scrolling_reasons_(0) {
   Init();
 }
 
 FrameView* FrameView::Create(LocalFrame& frame) {
   FrameView* view = new FrameView(frame);
   view->Show();
   return view;
 }
 
 FrameView* FrameView::Create(LocalFrame& frame, const IntSize& initial_size) {
@@ skipping 4927 matching lines @@
   }
 
   Frame* child = frame.Tree().FirstChild();
   while (child) {
     UpdateSubFrameScrollOnMainReason(*child, reasons);
     child = child->Tree().NextSibling();
   }
 
   if (frame.IsMainFrame())
     main_thread_scrolling_reasons_ = reasons;
+  DCHECK(!MainThreadScrollingReason::HasNonCompositedScrollReasons(
+      main_thread_scrolling_reasons_));
 }
 
 MainThreadScrollingReasons FrameView::MainThreadScrollingReasonsPerFrame()
     const {
   MainThreadScrollingReasons reasons =
       static_cast<MainThreadScrollingReasons>(0);
 
   if (ShouldThrottleRendering())
     return reasons;
 
@@ skipping 38 matching lines @@
   // Walk the tree to the root. Use the gathered reasons to determine
   // whether the target frame should be scrolled on main thread regardless
   // other subframes on the same page.
   for (Frame* frame = frame_; frame; frame = frame->Tree().Parent()) {
     if (!frame->IsLocalFrame())
       continue;
     reasons |=
         ToLocalFrame(frame)->View()->MainThreadScrollingReasonsPerFrame();
   }
 
+  DCHECK(!MainThreadScrollingReason::HasNonCompositedScrollReasons(reasons));
   return reasons;
 }
 
 String FrameView::MainThreadScrollingReasonsAsText() const {
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     DCHECK(Lifecycle().GetState() >= DocumentLifecycle::kPrePaintClean);
 
     // Slimming paint v2 stores main thread scrolling reasons on property
     // trees instead of in |m_mainThreadScrollingReasons|.
     MainThreadScrollingReasons reasons = 0;
@@ skipping 13 matching lines @@
             .c_str());
     return result;
   }
 
   String result(MainThreadScrollingReason::mainThreadScrollingReasonsAsText(
                     main_thread_scrolling_reasons_)
                     .c_str());
   return result;
 }
 
-void FrameView::AdjustStyleRelatedMainThreadScrollingReasons(
-    const uint32_t reason,
-    bool increase) {
-  int index = MainThreadScrollingReason::getReasonIndex(reason);
-  DCHECK_GE(index, 0);
-  main_thread_scrolling_reasons_counter_[index] += increase ? 1 : -1;
-  DCHECK_GE(main_thread_scrolling_reasons_counter_[index], 0);
-}
-
-MainThreadScrollingReasons
-FrameView::GetStyleRelatedMainThreadScrollingReasons() const {
-  MainThreadScrollingReasons reasons =
-      static_cast<MainThreadScrollingReasons>(0);
-  for (uint32_t reason = 0;
-       reason < MainThreadScrollingReason::kMainThreadScrollingReasonCount;
-       ++reason) {
-    if (main_thread_scrolling_reasons_counter_[reason] > 0) {
-      reasons |= 1 << reason;
-    }
-  }
-  return reasons;
-}
-
 void FrameView::SetViewportIntersectionFromParent(
     const IntRect& viewport_intersection) {
   if (remote_viewport_intersection_ != viewport_intersection) {
     remote_viewport_intersection_ = viewport_intersection;
     ScheduleAnimation();
   }
 }
 
 IntRect FrameView::RemoteViewportIntersection() {
   IntRect intersection(remote_viewport_intersection_);
@@ skipping 54 matching lines @@
 void FrameView::SetAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   animation_host_ = std::move(host);
 }
 
 LayoutUnit FrameView::CaretWidth() const {
   return LayoutUnit(GetHostWindow()->WindowToViewportScalar(1));
 }
 
 }  // namespace blink