Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/filter_operations.h

 // Copyright 2013 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.
 
 #ifndef CC_OUTPUT_FILTER_OPERATIONS_H_
 #define CC_OUTPUT_FILTER_OPERATIONS_H_
 
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 26 matching lines @@
   void Append(const FilterOperation& filter);
 
   // Removes all filter operations.
   void Clear();
 
   bool IsEmpty() const;
 
   void GetOutsets(int* top, int* right, int* bottom, int* left) const;
   bool HasFilterThatMovesPixels() const;
   bool HasFilterThatAffectsOpacity() const;
+  bool HasReferenceFilter() const;
 
   size_t size() const {
     return operations_.size();
   }
 
   const FilterOperation& at(size_t index) const {
     DCHECK_LT(index, size());
     return operations_[index];
   }
 
@@ skipping 12 matching lines @@
 
   scoped_ptr<base::Value> AsValue() const;
 
  private:
   std::vector<FilterOperation> operations_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_FILTER_OPERATIONS_H_