[SPInvalidation] Ignore clip failure in GeometryMapper::localToVisualRectInAncestorSpace()

third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp

 // Copyright 2016 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 "platform/graphics/paint/GeometryMapper.h"
 
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 FloatRect GeometryMapper::mapToVisualRectInDestinationSpace(
     const FloatRect& rect,
     const PropertyTreeState& sourceState,
     const PropertyTreeState& destinationState,
     bool& success) {
   FloatRect result = localToVisualRectInAncestorSpace(
@@ skipping 83 matching lines @@
     bool& success) {
   const auto& transformMatrix =
       localToAncestorMatrix(localState.transform(), ancestorState, success);
   if (!success)
     return rect;
 
   FloatRect mappedRect = transformMatrix.mapRect(rect);
 
   const auto clipRect =
       localToAncestorClipRect(localState, ancestorState, success);
-  DCHECK(success);
 
-  mappedRect.intersect(clipRect);
+  if (success) {
+    mappedRect.intersect(clipRect);
+  } else if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+    // On SPv1 we may fail when the paint invalidation container creates an
+    // overflow clip (in ancestorState) which is not in localState of an
+    // out-of-flow positioned descendant. See crbug.com/513108 and layout test
+    // compositing/overflow/handle-non-ancestor-clip-parent.html (run with
+    // --enable-prefer-compositing-to-lcd-text) for details.
+    // Ignore it for SPv1 for now.
+    success = true;
+  } else {
+    DCHECK(success);
+  }
+
   return mappedRect;
 }
 
 FloatRect GeometryMapper::localToAncestorRect(
     const FloatRect& rect,
     const PropertyTreeState& localState,
     const PropertyTreeState& ancestorState,
     bool& success) {
   const auto& transformMatrix =
       localToAncestorMatrix(localState.transform(), ancestorState, success);
@@ skipping 168 matching lines @@
 
   // Walk up until we find the ancestor.
   while (a != b) {
     a = a->parent();
     b = b->parent();
   }
   return a;
 }
 
 }  // namespace blink