blink: Add backdrop-filter support

Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1039 matching lines @@
 void GraphicsLayer::setFilters(const FilterOperations& filters)
 {
     SkiaImageFilterBuilder builder;
     OwnPtr<WebFilterOperations> webFilters = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
     FilterOutsets outsets = filters.outsets();
     builder.setCropOffset(FloatSize(outsets.left(), outsets.top()));
     builder.buildFilterOperations(filters, webFilters.get());
     m_layer->layer()->setFilters(*webFilters);
 }
 
+void GraphicsLayer::setBackdropFilters(const FilterOperations& filters)
+{
+    SkiaImageFilterBuilder builder;
+    OwnPtr<WebFilterOperations> webFilters = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
+    FilterOutsets outsets = filters.outsets();
+    builder.setCropOffset(FloatSize(outsets.left(), outsets.top()));
+    builder.buildFilterOperations(filters, webFilters.get());
+    m_layer->layer()->setBackgroundFilters(*webFilters);
+}
+
 void GraphicsLayer::setFilterQuality(SkFilterQuality filterQuality)
 {
     if (m_imageLayer)
         m_imageLayer->setNearestNeighbor(filterQuality == kNone_SkFilterQuality);
 }
 
 void GraphicsLayer::setPaintingPhase(GraphicsLayerPaintingPhase phase)
 {
     if (m_paintingPhase == phase)
         return;
@@ skipping 75 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif