cc: Remove tile sharing from tilings.

cc/resources/tiling_set_eviction_queue.h

Index: cc/resources/tiling_set_eviction_queue.h
diff --git a/cc/resources/tiling_set_eviction_queue.h b/cc/resources/tiling_set_eviction_queue.h
index 439bdbb1761f3e14a1d2ee7247e87dd840e3b4df..c89f2aa4e0b641d3c04476b3062d3dc23f78485e 100644
--- a/cc/resources/tiling_set_eviction_queue.h
+++ b/cc/resources/tiling_set_eviction_queue.h
@@ -23,6 +23,10 @@ namespace cc {
 // EVENTUALLY_RECT - Tiles in the eventually region of the tiling.
 // SOON_BORDER_RECT - Tiles in the prepainting skirt of the tiling.
 // SKEWPORT_RECT - Tiles in the skewport of the tiling.
+// PENDING_VISIBLE_RECT - Tiles that will be visible upon activation, not
+//     required for activation.
+// PENDING_VISIBLE_RECT_REQUIRED_FOR_ACTIVATION - Tiles that will be visible
+//     upon activation, required for activation.
 // VISIBLE_RECT_OCCLUDED - Occluded, not required for activation, visible tiles.
 // VISIBLE_RECT_UNOCCLUDED - Unoccluded, not required for activation, visible
 //     tiles.
@@ -74,6 +78,8 @@ class CC_EXPORT TilingSetEvictionQueue {
     EVENTUALLY_RECT,
     SOON_BORDER_RECT,
     SKEWPORT_RECT,
+    PENDING_VISIBLE_RECT,
+    PENDING_VISIBLE_RECT_REQUIRED_FOR_ACTIVATION,
     VISIBLE_RECT_OCCLUDED,
     VISIBLE_RECT_UNOCCLUDED,
     VISIBLE_RECT_REQUIRED_FOR_ACTIVATION_OCCLUDED,
@@ -88,7 +94,8 @@ class CC_EXPORT TilingSetEvictionQueue {
     EvictionRectIterator();
     EvictionRectIterator(std::vector<PictureLayerTiling*>* tilings,
                          WhichTree tree,
-                         bool skip_shared_out_of_order_tiles);
+                         bool skip_shared_out_of_order_tiles,
+                         bool skip_pending_visible_rect);
 
     bool done() const { return !tile_; }
     Tile* operator*() const { return tile_; }
@@ -105,9 +112,27 @@ class CC_EXPORT TilingSetEvictionQueue {
     std::vector<PictureLayerTiling*>* tilings_;
     WhichTree tree_;
     bool skip_shared_out_of_order_tiles_;
+    bool skip_pending_visible_rect_;
     size_t tiling_index_;
   };
 
+  class PendingVisibleTilingIterator : public EvictionRectIterator {
+   public:
+    PendingVisibleTilingIterator() = default;
+    PendingVisibleTilingIterator(std::vector<PictureLayerTiling*>* tilings,
+                                 WhichTree tree,
+                                 bool skip_shared_out_of_order_tiles,
+                                 bool return_required_for_activation_tiles);
+
+    PendingVisibleTilingIterator& operator++();
+
+   private:
+    bool TileMatchesRequiredFlags(const Tile* tile) const;
+
+    TilingData::DifferenceIterator iterator_;
+    bool return_required_for_activation_tiles_;
+  };
+
   class VisibleTilingIterator : public EvictionRectIterator {
    public:
     VisibleTilingIterator() = default;
@@ -177,6 +202,7 @@ class CC_EXPORT TilingSetEvictionQueue {
   EventuallyTilingIterator eventually_iterator_;
   SoonBorderTilingIterator soon_iterator_;
   SkewportTilingIterator skewport_iterator_;
+  PendingVisibleTilingIterator pending_visible_iterator_;
   VisibleTilingIterator visible_iterator_;
 };