cc: Ensure to skip the first tile that would be returned by twin.

cc/resources/raster_tile_priority_queue.h

Index: cc/resources/raster_tile_priority_queue.h
diff --git a/cc/resources/raster_tile_priority_queue.h b/cc/resources/raster_tile_priority_queue.h
index a7ec9e00b533f7f4e6bab258bf1a1a989f25e98e..deaa17e02475eeb4655aad6612f84d4893fc5042 100644
--- a/cc/resources/raster_tile_priority_queue.h
+++ b/cc/resources/raster_tile_priority_queue.h
@@ -28,6 +28,7 @@ class CC_EXPORT RasterTilePriorityQueue {
     void Pop(TreePriority tree_priority);
 
     WhichTree NextTileIteratorTree(TreePriority tree_priority) const;
+    void SkipNextSharedTileReturnedByTwin(TreePriority tree_priority);

[reveman, 2014/10/10 14:27:23]

I'm a bit confused by this name. Sounds like it will only every skip one tile
and it does so unconditionally? Is that really the case?

[vmpstr, 2014/10/10 15:24:05]

No, I renamed to SkipTilesReturnedByTwin... It just skips the next (possibly
several) tiles that have a priority better suited for the other iterator. If you
have a different name suggestion, let me know.

 
     PictureLayerImpl::LayerRasterTileIterator active_iterator;
     PictureLayerImpl::LayerRasterTileIterator pending_iterator;