cc: Clear the invalidation history when moving between compositors.

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index e7918e220625cf3f7b90aa246deee79164b0b5cf..1cfe1f1d8480a9cd6fac8d1723fa105bb5eca72d 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -89,6 +89,7 @@ void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
                             host->settings().default_tile_grid_size));
       }
     }
+    recording_source_->DidMoveToNewCompositor();
     recording_source_->SetSlowdownRasterScaleFactor(
         host->debug_state().slow_down_raster_scale_factor);
   }