Adds filter support for offscreen canvas

third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h

Index: third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h
diff --git a/third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h b/third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h
index 860533e4f2f852391844ea75ed87f46fba2a6819..439f2d7b4eab5ba998224acafa1a1269cfdb54b4 100644
--- a/third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h
+++ b/third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h
@@ -24,6 +24,7 @@
 #define FilterOperationResolver_h
 
 #include "core/CSSValueKeywords.h"
+#include "core/css/CSSToLengthConversionData.h"
 #include "core/style/FilterOperations.h"
 #include "platform/heap/Handle.h"
 
@@ -32,13 +33,14 @@ namespace blink {
 class CSSValue;
 class StyleResolverState;
 
-class FilterOperationResolver {
+class CORE_EXPORT FilterOperationResolver {
   STATIC_ONLY(FilterOperationResolver);
 
  public:
   static FilterOperation::OperationType filterOperationForType(CSSValueID);
   static FilterOperations createFilterOperations(StyleResolverState&,
                                                  const CSSValue&);
+  static FilterOperations createOffscreenFilterOperations(const CSSValue&);
 };
 
 }  // namespace blink