blink: Add backdrop-filter support

Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp

Index: Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
diff --git a/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp b/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
index 3a2c3683122e2867aee88aab8fefe3fec6ada5e3..7bc4b0c27634e34bf035b508c65abc28445db1db 100644
--- a/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
+++ b/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
@@ -227,6 +227,7 @@ void CompositedDeprecatedPaintLayerMapping::createPrimaryGraphicsLayer()
     updateOpacity(layoutObject()->styleRef());
     updateTransform(layoutObject()->styleRef());
     updateFilters(layoutObject()->styleRef());
+    updateBackdropFilters(layoutObject()->styleRef());
 
     if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
         updateLayerBlendMode(layoutObject()->styleRef());
@@ -276,6 +277,11 @@ void CompositedDeprecatedPaintLayerMapping::updateFilters(const ComputedStyle& s
     m_graphicsLayer->setFilters(owningLayer().computeFilterOperations(style));
 }
 
+void CompositedDeprecatedPaintLayerMapping::updateBackdropFilters(const ComputedStyle& style)
+{
+    m_graphicsLayer->setBackdropFilters(owningLayer().computeBackdropFilterOperations(style));
+}
+
 void CompositedDeprecatedPaintLayerMapping::updateLayerBlendMode(const ComputedStyle& style)
 {
     setBlendMode(style.blendMode());
@@ -660,6 +666,9 @@ void CompositedDeprecatedPaintLayerMapping::updateGraphicsLayerGeometry(const De
     if (!layoutObject()->style()->isRunningFilterAnimationOnCompositor())
         updateFilters(layoutObject()->styleRef());
 
+    if (!layoutObject()->style()->isRunningBackdropFilterAnimationOnCompositor())
+        updateBackdropFilters(layoutObject()->styleRef());
+
     // We compute everything relative to the enclosing compositing layer.
     IntRect ancestorCompositingBounds;
     if (compositingContainer) {