cc: Remove tile sharing from tilings.

cc/resources/active_picture_layer_tiling.h

Index: cc/resources/active_picture_layer_tiling.h
diff --git a/cc/resources/active_picture_layer_tiling.h b/cc/resources/active_picture_layer_tiling.h
new file mode 100644
index 0000000000000000000000000000000000000000..d905585d7564b462ce024d5269fe23417d70458e
--- /dev/null
+++ b/cc/resources/active_picture_layer_tiling.h
@@ -0,0 +1,72 @@
+// 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 CC_RESOURCES_ACTIVE_PICTURE_LAYER_TILING_H_
+#define CC_RESOURCES_ACTIVE_PICTURE_LAYER_TILING_H_
+
+#include <map>
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/base/cc_export.h"
+#include "cc/base/region.h"
+#include "cc/base/tiling_data.h"
+#include "cc/resources/picture_layer_tiling.h"
+#include "cc/resources/tile.h"
+#include "cc/resources/tile_priority.h"
+#include "cc/trees/occlusion.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace base {
+namespace trace_event {
+class TracedValue;
+}
+}
+
+namespace cc {
+
+class PictureLayerTiling;
+class RasterSource;
+
+class CC_EXPORT ActivePictureLayerTiling : public PictureLayerTiling {
+ public:
+  // Create a tiling with no tiles. CreateTile() must be called to add some.
+  static scoped_ptr<PictureLayerTiling> Create(
+      float contents_scale,
+      scoped_refptr<RasterSource> raster_source,
+      PictureLayerTilingClient* client,
+      size_t max_tiles_for_interest_area,
+      float skewport_target_time_in_seconds,
+      int skewport_extrapolation_limit_in_content_pixels);
+  ~ActivePictureLayerTiling() override;
+
+  void SetRasterSourceAndResize(
+      const scoped_refptr<RasterSource> raster_source) override;
+  void Invalidate(const Region& layer_invalidation) override;
+  void SetRasterSourceOnTiles() override;
+  void CreateMissingTilesInLiveTilesRect() override;
+  void TakeTilesAndPropertiesFrom(PictureLayerTiling* pending_twin) override;
+
+  bool IsTileOccluded(const Tile* tile) const override;
+  bool IsTileRequiredForActivation(const Tile* tile) const override;
+  bool IsTileRequiredForDraw(const Tile* tile) const override;
+
+ protected:
+  ActivePictureLayerTiling(float contents_scale,
+                           scoped_refptr<RasterSource> raster_source,
+                           PictureLayerTilingClient* client,
+                           size_t max_tiles_for_interest_area,
+                           float skewport_target_time_in_seconds,
+                           int skewport_extrapolation_limit_in_content_pixels);
+
+  void SetLiveTilesRect(const gfx::Rect& new_live_tiles_rect) override;
+  bool IsTileOccludedOnActiveTree(const Tile* tile) const;
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_ACTIVE_PICTURE_LAYER_TILING_H_