blink: Add backdrop-filter support

Source/core/paint/DeprecatedPaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 335 matching lines @@
     bool paintsWithTransform(GlobalPaintFlags) const;
 
     // Returns true if background phase is painted opaque in the given rect.
     // The query rect is given in local coordinates.
     bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const;
 
     bool containsDirtyOverlayScrollbars() const { return m_containsDirtyOverlayScrollbars; }
     void setContainsDirtyOverlayScrollbars(bool dirtyScrollbars) { m_containsDirtyOverlayScrollbars = dirtyScrollbars; }
 
     FilterOperations computeFilterOperations(const ComputedStyle&);
+    FilterOperations computeBackdropFilterOperations(const ComputedStyle&);
     bool paintsWithFilters() const;
+    bool paintsWithBackdropFilters() const;
     FilterEffectBuilder* filterEffectBuilder() const
     {
         DeprecatedPaintLayerFilterInfo* filterInfo = this->filterInfo();
         return filterInfo ? filterInfo->builder() : 0;
     }
 
     DeprecatedPaintLayerFilterInfo* filterInfo() const { return hasFilterInfo() ? DeprecatedPaintLayerFilterInfo::filterInfoForLayer(this) : 0; }
     DeprecatedPaintLayerFilterInfo* ensureFilterInfo() { return DeprecatedPaintLayerFilterInfo::createFilterInfoForLayerIfNeeded(this); }
     void removeFilterInfoIfNeeded()
     {
@@ skipping 352 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::DeprecatedPaintLayer*);
 void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif // Layer_h