[SPv2] Add CSS mask support

third_party/WebKit/Source/core/layout/compositing/CompositingReasonFinder.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/layout/compositing/CompositingReasonFinder.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
@@ skipping 160 matching lines @@
 }
 
 bool CompositingReasonFinder::requiresCompositingForAnimation(
     const ComputedStyle& style) {
   if (style.subtreeWillChangeContents())
     return style.isRunningAnimationOnCompositor();
 
   return style.shouldCompositeForCurrentAnimations();
 }
 
+bool CompositingReasonFinder::requiresCompositingForOpacityAnimation(
+    const ComputedStyle& style) {
+  return style.subtreeWillChangeContents()
+             ? style.isRunningOpacityAnimationOnCompositor()
+             : style.hasCurrentOpacityAnimation();
+}
+
+bool CompositingReasonFinder::requiresCompositingForFilterAnimation(
+    const ComputedStyle& style) {
+  return style.subtreeWillChangeContents()
+             ? style.isRunningFilterAnimationOnCompositor()
+             : style.hasCurrentFilterAnimation();
+}
+
+bool CompositingReasonFinder::requiresCompositingForBackdropFilterAnimation(
+    const ComputedStyle& style) {
+  return style.subtreeWillChangeContents()
+             ? style.isRunningBackdropFilterAnimationOnCompositor()
+             : style.hasCurrentBackdropFilterAnimation();
+}
+
 bool CompositingReasonFinder::requiresCompositingForEffectAnimation(
     const ComputedStyle& style) {
-  if (style.subtreeWillChangeContents()) {
-    return style.isRunningOpacityAnimationOnCompositor() ||
-           style.isRunningFilterAnimationOnCompositor() ||
-           style.isRunningBackdropFilterAnimationOnCompositor();
-  }
-
-  return style.hasCurrentOpacityAnimation() ||
-         style.hasCurrentFilterAnimation() ||
-         style.hasCurrentBackdropFilterAnimation();
+  return requiresCompositingForOpacityAnimation(style) ||
+         requiresCompositingForFilterAnimation(style) ||
+         requiresCompositingForBackdropFilterAnimation(style);
 }
 
 bool CompositingReasonFinder::requiresCompositingForTransformAnimation(
     const ComputedStyle& style) {
   return style.subtreeWillChangeContents()
              ? style.isRunningTransformAnimationOnCompositor()
              : style.hasCurrentTransformAnimation();
 }
 
 bool CompositingReasonFinder::requiresCompositingForScrollDependentPosition(
@@ skipping 12 matching lines @@
   // Don't promote fixed position elements that are descendants of a non-view
   // container, e.g. transformed elements.  They will stay fixed wrt the
   // container rather than the enclosing frame.
   if (layer->sticksToViewport())
     return m_layoutView.frameView()->isScrollable();
   return layer->layoutObject()->style()->position() == EPosition::kSticky &&
          layer->ancestorOverflowLayer()->scrollsOverflow();
 }
 
 }  // namespace blink