diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/core/SkTileGridPicture.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/core/SkTileGridPicture.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTileGridPicture_DEFINED
+#define SkTileGridPicture_DEFINED
+
+#include "SkPicture.h"
+#include "SkPoint.h"
+#include "SkSize.h"
+
+/**
+ * Subclass of SkPicture that override the behavior of the
+ * kOptimizeForClippedPlayback_RecordingFlag by creating an SkTileGrid
+ * structure rather than an R-Tree. The tile grid has lower recording
+ * and playback costs, but is less effective at eliminating extraneous
+ * primitives for arbitrary query rectangles. It is most effective for
+ * tiled playback when the tile structure is known at record time.
+ */
+class SK_API SkTileGridPicture : public SkPicture {
+public:
+    struct TileGridInfo {
+        /** Tile placement interval */
+        SkISize  fTileInterval;
+
+        /** Pixel coverage overlap between adjacent tiles */
+        SkISize  fMargin;
+
+        /** Offset added to device-space bounding box positions to convert
+          * them to tile-grid space. This can be used to adjust the "phase"
+          * of the tile grid to match probable query rectangles that will be
+          * used to search into the tile grid. As long as the offset is smaller
+          * or equal to the margin, there is no need to extend the domain of
+          * the tile grid to prevent data loss.
+          */
+        SkIPoint fOffset;
+    };
+    /**
+     * Constructor
+     * @param width recording canvas width in device pixels
+     * @param height recording canvas height in device pixels
+     * @param info description of the tiling layout
+     */
+    SkTileGridPicture(int width, int height, const TileGridInfo& info);
+
+    virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
+
+private:
+    int fXTileCount, fYTileCount;
+    TileGridInfo fInfo;
+};
+
+#endif