Remove old paint offset caching code

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 239 matching lines @@
     , m_parent(nullptr)
     , m_previous(nullptr)
     , m_next(nullptr)
 #if ENABLE(ASSERT)
     , m_hasAXObject(false)
     , m_setNeedsLayoutForbidden(false)
 #endif
     , m_bitfields(node)
 {
     // TODO(wangxianzhu): Move this into initialization list when we enable the feature by default.
-    if (RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled())
+    if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
         m_previousPositionFromPaintInvalidationBacking = uninitializedPaintOffset();
 
 #ifndef NDEBUG
     layoutObjectCounter().increment();
 #endif
     InstanceCounters::incrementCounter(InstanceCounters::LayoutObjectCounter);
 }
 
 LayoutObject::~LayoutObject()
 {
@@ skipping 1144 matching lines @@
         PaintLayer& layer = paintInvalidationState.enclosingSelfPaintingLayer(*this);
         if (layer.layoutObject() != this)
             layer.setNeedsPaintPhaseDescendantOutlines();
     }
 
     LayoutView* v = view();
     if (v->document().printing())
         return PaintInvalidationNone; // Don't invalidate paints if we're printing.
 
     const LayoutRect oldBounds = previousPaintInvalidationRect();
-    const LayoutPoint oldLocation = RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() ? LayoutPoint() : previousPositionFromPaintInvalidationBacking();
+    const LayoutPoint oldLocation = RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() ? LayoutPoint() : previousPositionFromPaintInvalidationBacking();
     LayoutRect newBounds = boundsRectForPaintInvalidation(paintInvalidationContainer, &paintInvalidationState);
-    LayoutPoint newLocation = RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() ? LayoutPoint() : PaintLayer::positionFromPaintInvalidationBacking(this, &paintInvalidationContainer, &paintInvalidationState);
+    LayoutPoint newLocation = RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() ? LayoutPoint() : PaintLayer::positionFromPaintInvalidationBacking(this, &paintInvalidationContainer, &paintInvalidationState);
 
     // Composited scrolling should not be included in the bounds and position tracking, because the graphics layer backing the scroller
     // does not move on scroll.
     if (paintInvalidationContainer.usesCompositedScrolling() && &paintInvalidationContainer != this) {
         LayoutSize inverseOffset(toLayoutBox(&paintInvalidationContainer)->scrolledContentOffset());
         newLocation.move(inverseOffset);
         newBounds.move(inverseOffset);
     }
 
     setPreviousPaintInvalidationRect(newBounds);
-    if (!RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled())
+    if (!RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
         setPreviousPositionFromPaintInvalidationBacking(newLocation);
 
     if (!shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() && !paintInvalidationState.forcedSubtreeInvalidationWithinContainer()) {
         ASSERT(paintInvalidationState.forcedSubtreeInvalidationRectUpdateWithinContainer());
         return PaintInvalidationNone;
     }
 
     PaintInvalidationReason invalidationReason = paintInvalidationReason(paintInvalidationContainer, oldBounds, oldLocation, newBounds, newLocation);
 
     // We need to invalidate the selection before checking for whether we are doing a full invalidation.
     // This is because we need to update the old rect regardless.
     invalidateSelectionIfNeeded(paintInvalidationContainer, paintInvalidationState, invalidationReason);
 
     TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("blink.invalidation"), "LayoutObject::invalidatePaintIfNeeded()",
         "object", this->debugName().ascii(),
         "info", jsonObjectForOldAndNewRects(oldBounds, oldLocation, newBounds, newLocation));
 
     bool boxDecorationBackgroundObscured = boxDecorationBackgroundIsKnownToBeObscured();
     if (!isFullPaintInvalidationReason(invalidationReason) && boxDecorationBackgroundObscured != m_bitfields.lastBoxDecorationBackgroundObscured())
         invalidationReason = PaintInvalidationBackgroundObscurationChange;
     m_bitfields.setLastBoxDecorationBackgroundObscured(boxDecorationBackgroundObscured);
 
     if (invalidationReason == PaintInvalidationNone) {
         // TODO(trchen): Currently we don't keep track of paint offset of layout objects.
         // There are corner cases that the display items need to be invalidated for paint offset
         // mutation, but incurs no pixel difference (i.e. bounds stay the same) so no rect-based
         // invalidation is issued. See crbug.com/508383 and crbug.com/515977.
         // This is a workaround to force display items to update paint offset.
-        if (!RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() && paintInvalidationState.forcedSubtreeInvalidationWithinContainer())
+        if (!RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() && paintInvalidationState.forcedSubtreeInvalidationWithinContainer())
             invalidateDisplayItemClientsWithPaintInvalidationState(paintInvalidationContainer, paintInvalidationState, invalidationReason);
 
         return invalidationReason;
     }
 
     invalidateDisplayItemClientsWithPaintInvalidationState(paintInvalidationContainer, paintInvalidationState, invalidationReason);
 
     if (invalidationReason == PaintInvalidationIncremental) {
         incrementallyInvalidatePaint(paintInvalidationContainer, oldBounds, newBounds, newLocation);
         return invalidationReason;
@@ skipping 2236 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif