cc: Remove invalidated recycle tree tiles on activation.

cc/resources/picture_layer_tiling_set.cc

Index: cc/resources/picture_layer_tiling_set.cc
diff --git a/cc/resources/picture_layer_tiling_set.cc b/cc/resources/picture_layer_tiling_set.cc
index 3d295c51c6c770d7a2e5b0461ef8385e6fada5f1..bbe4070eaf53b3dd798af9ad76653ee29fcfe84c 100644
--- a/cc/resources/picture_layer_tiling_set.cc
+++ b/cc/resources/picture_layer_tiling_set.cc
@@ -36,6 +36,11 @@ void PictureLayerTilingSet::SetClient(PictureLayerTilingClient* client) {
     tilings_[i]->SetClient(client_);
 }
 
+void PictureLayerTilingSet::RemoveTilesInRegion(const Region& region) {
+  for (size_t i = 0; i < tilings_.size(); ++i)
+    tilings_[i]->RemoveTilesInRegion(region);
+}
+
 bool PictureLayerTilingSet::SyncTilings(const PictureLayerTilingSet& other,
                                         const gfx::Size& new_layer_bounds,
                                         const Region& layer_invalidation,