Cache display items from SVGImage contents.

third_party/WebKit/Source/platform/graphics/paint/SkPictureBuilder.h

 // Copyright 2015 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 SkPictureBuilder_h
 #define SkPictureBuilder_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
@@ skipping 13 matching lines @@
 // rely on PaintController here.
 class PLATFORM_EXPORT SkPictureBuilder final : public DisplayItemClient {
   WTF_MAKE_NONCOPYABLE(SkPictureBuilder);
 
  public:
   // Constructs a new builder with the given bounds for the resulting recorded
   // picture. If |metadata| is specified, that metadata is propagated to the
   // builder's internal canvas. If |containingContext| is specified, the device
   // scale factor, printing, and disabled state are propagated to the builder's
   // internal context.
+  // If a PaintController is passed, it is used as the PaintController for
+  // painting the picture (and hence we can use its cache). Otherwise, a new
+  // PaintController is used for the duration of the picture building, which
+  // therefore has no caching.
   SkPictureBuilder(const FloatRect& bounds,
                    SkMetaData* = nullptr,
-                   GraphicsContext* containingContext = nullptr);
+                   GraphicsContext* containingContext = nullptr,
+                   PaintController* = nullptr);
   ~SkPictureBuilder();
 
   GraphicsContext& context() { return *m_context; }
 
   // Returns a picture capturing all drawing performed on the builder's context
   // since construction.
   sk_sp<SkPicture> endRecording();
 
   // DisplayItemClient methods
   String debugName() const final { return "SkPictureBuilder"; }
   LayoutRect visualRect() const final { return LayoutRect(); }
 
  private:
-  std::unique_ptr<PaintController> m_paintController;
+  PaintController* m_paintController;
+  std::unique_ptr<PaintController> m_paintControllerPtr;
   std::unique_ptr<GraphicsContext> m_context;
   FloatRect m_bounds;
 };
 
 }  // namespace blink
 
 #endif  // SkPictureBuilder_h