Invalidate subsequence caching & empty paint phases if clips changed.

third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp

 // Copyright 2014 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 "core/paint/PaintLayerPainter.h"
 
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/ClipPathClipper.h"
 #include "core/paint/FilterPainter.h"
@@ skipping 208 matching lines @@
 
   // Repaint subsequence if the layer is marked for needing repaint.
   // We don't set needsResetEmptyPaintPhase here, but clear the empty paint
   // phase flags in PaintLayer::setNeedsPaintPhaseXXX(), to ensure that we won't
   // clear previousPaintPhaseXXXEmpty flags when unrelated things changed which
   // won't cause the paint phases to become non-empty.
   if (paintLayer.needsRepaint())
     needsRepaint = true;
 
   // Repaint if layer's clip changes.
-  // TODO(chrishtr): implement detecting clipping changes in SPv2.
-  // crbug.com/645667
-  if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+  if (!RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled()) {
     ClipRects& clipRects = paintLayer.clipper().paintingClipRects(
         paintingInfo.rootLayer, respectOverflowClip, subpixelAccumulation);
     ClipRects* previousClipRects = paintLayer.previousPaintingClipRects();
     if (&clipRects != previousClipRects &&
         (!previousClipRects || clipRects != *previousClipRects)) {
       needsRepaint = true;
       shouldClearEmptyPaintPhaseFlags = true;
     }
     paintLayer.setPreviousPaintingClipRects(clipRects);
   }
@@ skipping 946 matching lines @@
           context, layoutObject, PaintPhaseClippingMask))
     return;
 
   IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
   LayoutObjectDrawingRecorder drawingRecorder(
       context, layoutObject, PaintPhaseClippingMask, snappedClipRect);
   context.fillRect(snappedClipRect, Color::black);
 }
 
 }  // namespace blink