Track slow paths in DisplayItemList

cc/paint/paint_op_buffer.h

 // Copyright 2017 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_PAINT_PAINT_OP_BUFFER_H_
 #define CC_PAINT_PAINT_OP_BUFFER_H_
 
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 357 matching lines @@
   // provide them here explicitly so that DisplayItemList doesn't have
   // to be defined in this header.
   DrawDisplayItemListOp(const DrawDisplayItemListOp& op);
   DrawDisplayItemListOp& operator=(const DrawDisplayItemListOp& op);
   ~DrawDisplayItemListOp();
   static void Raster(const PaintOp* op,
                      SkCanvas* canvas,
                      const SkMatrix& original_ctm);
   size_t AdditionalBytesUsed() const;
   bool HasDiscardableImages() const;
-  // TODO(enne): DisplayItemList should know number of slow paths.
+  int CountSlowPaths() const;
 
   scoped_refptr<DisplayItemList> list;
 };
 
 struct CC_PAINT_EXPORT DrawDRRectOp final : PaintOpWithFlags {
   static constexpr PaintOpType kType = PaintOpType::DrawDRRect;
   static constexpr bool kIsDrawOp = true;
   DrawDRRectOp(const SkRRect& outer,
                const SkRRect& inner,
                const PaintFlags& flags)
@@ skipping 577 matching lines @@
   // Record additional bytes used by referenced sub-records and display lists.
   size_t subrecord_bytes_used_ = 0;
   bool has_discardable_images_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(PaintOpBuffer);
 };
 
 }  // namespace cc
 
 #endif  // CC_PAINT_PAINT_OP_BUFFER_H_