Update perspective paint properties on perspective-origin changes

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

 // Copyright 2015 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/PaintPropertyTreeBuilder.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutInline.h"
@@ skipping 608 matching lines @@
                                       FloatRoundedRect(FloatRect(clipRect)));
   }
 
   const auto* properties = object.paintProperties();
   if (properties && properties->overflowClip())
     context.current.clip = properties->overflowClip();
 }
 
 static FloatPoint perspectiveOrigin(const LayoutBox& box) {
   const ComputedStyle& style = box.styleRef();
+  // Perspective origin has no effect without perspective.
+  DCHECK(style.hasPerspective());
   FloatSize borderBoxSize(box.size());
   return FloatPoint(
       floatValueForLength(style.perspectiveOriginX(), borderBoxSize.width()),
       floatValueForLength(style.perspectiveOriginY(), borderBoxSize.height()));
 }
 
 void PaintPropertyTreeBuilder::updatePerspective(
     const LayoutObject& object,
     PaintPropertyTreeBuilderContext& context) {
   if (object.needsPaintPropertyUpdate() || context.forceSubtreeUpdate) {
@@ skipping 332 matching lines @@
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 
   context.forceSubtreeUpdate |= object.subtreeNeedsPaintPropertyUpdate();
 }
 
 }  // namespace blink