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diff --git a/xfa_test/pdf/paint_aggregator.h b/xfa_test/pdf/paint_aggregator.h
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+++ b/xfa_test/pdf/paint_aggregator.h
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+// Copyright (c) 2010 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 PDF_PAINT_AGGREGATOR_H_
+#define PDF_PAINT_AGGREGATOR_H_
+
+#include <vector>
+
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/rect.h"
+
+// This class is responsible for aggregating multiple invalidation and scroll
+// commands to produce a scroll and repaint sequence. You can use this manually
+// to track your updates, but most applications will use the PaintManager to
+// additionally handle the necessary callbacks on top of the PaintAggregator
+// functionality.
+//
+// See http://code.google.com/p/ppapi/wiki/2DPaintingModel
+class PaintAggregator {
+ public:
+  // Stores information about a rectangle that has finished painting.  The
+  // PaintManager will paint it only when everything else on the screen is also
+  // ready.
+  struct ReadyRect {
+    pp::Point offset;
+    pp::Rect rect;
+    pp::ImageData image_data;
+  };
+
+  struct PaintUpdate {
+    PaintUpdate();
+    ~PaintUpdate();
+
+    // True if there is a scroll applied. This indicates that the scroll delta
+    // and scroll_rect are nonzero (just as a convenience).
+    bool has_scroll;
+
+    // The amount to scroll by. Either the X or Y may be nonzero to indicate a
+    // scroll in that direction, but there will never be a scroll in both
+    // directions at the same time (this will be converted to a paint of the
+    // region instead).
+    //
+    // If there is no scroll, this will be (0, 0).
+    pp::Point scroll_delta;
+
+    // The rectangle that should be scrolled by the scroll_delta. If there is no
+    // scroll, this will be (0, 0, 0, 0). We only track one scroll command at
+    // once. If there are multiple ones, they will be converted to invalidates.
+    pp::Rect scroll_rect;
+
+    // A list of all the individual dirty rectangles. This is an aggregated list
+    // of all invalidate calls. Different rectangles may be unified to produce a
+    // minimal list with no overlap that is more efficient to paint. This list
+    // also contains the region exposed by any scroll command.
+    std::vector<pp::Rect> paint_rects;
+  };
+
+  PaintAggregator();
+
+  // There is a PendingUpdate if InvalidateRect or ScrollRect were called and
+  // ClearPendingUpdate was not called.
+  bool HasPendingUpdate() const;
+  void ClearPendingUpdate();
+
+  PaintUpdate GetPendingUpdate();
+
+  // Sets the result of a call to the plugin to paint.  This includes rects that
+  // are finished painting (ready), and ones that are still in-progress
+  // (pending).
+  void SetIntermediateResults(const std::vector<ReadyRect>& ready,
+                              const std::vector<pp::Rect>& pending);
+
+  // Returns the rectangles that are ready to be painted.
+  std::vector<ReadyRect> GetReadyRects() const;
+
+  // The given rect should be repainted.
+  void InvalidateRect(const pp::Rect& rect);
+
+  // The given rect should be scrolled by the given amounts.
+  void ScrollRect(const pp::Rect& clip_rect, const pp::Point& amount);
+
+ private:
+  // This structure is an internal version of PaintUpdate. It's different in
+  // two respects:
+  //
+  //  - The scroll damange (area exposed by the scroll operation, if any) is
+  //    maintained separately from the dirty rects generated by calling
+  //    InvalidateRect. We need to know this distinction for some operations.
+  //
+  //  - The paint bounds union is computed on the fly so we don't have to keep
+  //    a rectangle up-to-date as we do different operations.
+  class InternalPaintUpdate {
+   public:
+    InternalPaintUpdate();
+    ~InternalPaintUpdate();
+
+    // Computes the rect damaged by scrolling within |scroll_rect| by
+    // |scroll_delta|. This rect must be repainted. It is not included in
+    // paint_rects.
+    pp::Rect GetScrollDamage() const;
+
+    pp::Point scroll_delta;
+    pp::Rect scroll_rect;
+
+    // Does not include the scroll damage rect unless
+    // synthesized_scroll_damage_rect_ is set.
+    std::vector<pp::Rect> paint_rects;
+
+    // Rectangles that are finished painting.
+    std::vector<ReadyRect> ready_rects;
+
+    // Whether we have added the scroll damage rect to paint_rects yet or not.
+    bool synthesized_scroll_damage_rect_;
+  };
+
+  pp::Rect ScrollPaintRect(const pp::Rect& paint_rect,
+                           const pp::Point& amount) const;
+  void InvalidateScrollRect();
+
+  // Internal method used by InvalidateRect. If |check_scroll| is true, then the
+  // method checks if there's a pending scroll and if so also invalidates |rect|
+  // in the new scroll position.
+  void InvalidateRectInternal(const pp::Rect& rect, bool check_scroll);
+
+  InternalPaintUpdate update_;
+};
+
+#endif  // PDF_PAINT_AGGREGATOR_H_