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 185 matching lines @@
       m_subtreeThrottled(false),
       m_lifecycleUpdatesThrottled(false),
       m_needsPaintPropertyUpdate(true),
       m_currentUpdateLifecyclePhasesTargetState(
           DocumentLifecycle::Uninitialized),
       m_scrollAnchor(this),
       m_scrollbarManager(*this),
       m_needsScrollbarsUpdate(false),
       m_suppressAdjustViewSize(false),
       m_allowsLayoutInvalidationAfterLayoutClean(true),
-      m_mainThreadScrollingReasons(0),
-      m_mainThreadScrollingReasonsCounter(
-          MainThreadScrollingReason::kMainThreadScrollingReasonCount,
-          0) {
+      m_mainThreadScrollingReasons(0) {
   init();
 }
 
 FrameView* FrameView::create(LocalFrame& frame) {
   FrameView* view = new FrameView(frame);
   view->show();
   return view;
 }
 
 FrameView* FrameView::create(LocalFrame& frame, const IntSize& initialSize) {
@@ skipping 4863 matching lines @@
   }
 
   Frame* child = frame.tree().firstChild();
   while (child) {
     updateSubFrameScrollOnMainReason(*child, reasons);
     child = child->tree().nextSibling();
   }
 
   if (frame.isMainFrame())
     m_mainThreadScrollingReasons = reasons;
+  DCHECK(!MainThreadScrollingReason::NonCompositedScrollReasons(
+      m_mainThreadScrollingReasons));
 }
 
 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 = m_frame; frame; frame = frame->tree().parent()) {
     if (!frame->isLocalFrame())
       continue;
     reasons |=
         toLocalFrame(frame)->view()->mainThreadScrollingReasonsPerFrame();
   }
 
+  DCHECK(!MainThreadScrollingReason::NonCompositedScrollReasons(reasons));
   return reasons;
 }
 
 String FrameView::mainThreadScrollingReasonsAsText() const {
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     DCHECK(lifecycle().state() >= DocumentLifecycle::PrePaintClean);
 
     // Slimming paint v2 stores main thread scrolling reasons on property
     // trees instead of in |m_mainThreadScrollingReasons|.
     MainThreadScrollingReasons reasons = 0;
@@ skipping 12 matching lines @@
             .c_str());
     return result;
   }
 
   String result(MainThreadScrollingReason::mainThreadScrollingReasonsAsText(
                     m_mainThreadScrollingReasons)
                     .c_str());
   return result;
 }
 
-void FrameView::adjustStyleRelatedMainThreadScrollingReasons(
-    const uint32_t reason,
-    bool increase) {
-  int index = MainThreadScrollingReason::getReasonIndex(reason);
-  DCHECK_GE(index, 0);
-  m_mainThreadScrollingReasonsCounter[index] += increase ? 1 : -1;
-  DCHECK_GE(m_mainThreadScrollingReasonsCounter[index], 0);
-}
-
-MainThreadScrollingReasons
-FrameView::getStyleRelatedMainThreadScrollingReasons() const {
-  MainThreadScrollingReasons reasons =
-      static_cast<MainThreadScrollingReasons>(0);
-  for (uint32_t reason = 0;
-       reason < MainThreadScrollingReason::kMainThreadScrollingReasonCount;
-       ++reason) {
-    if (m_mainThreadScrollingReasonsCounter[reason] > 0) {
-      reasons |= 1 << reason;
-    }
-  }
-  return reasons;
-}
-
 void FrameView::setViewportIntersectionFromParent(
     const IntRect& viewportIntersection) {
   if (m_remoteViewportIntersection != viewportIntersection) {
     m_remoteViewportIntersection = viewportIntersection;
     scheduleAnimation();
   }
 }
 
 IntRect FrameView::remoteViewportIntersection() {
   IntRect intersection(m_remoteViewportIntersection);
@@ skipping 53 matching lines @@
 void FrameView::setAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   m_animationHost = std::move(host);
 }
 
 LayoutUnit FrameView::caretWidth() const {
   return LayoutUnit(getHostWindow()->windowToViewportScalar(1));
 }
 
 }  // namespace blink