cc: Declare high res tilings to not have low res content.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 353e670d510e5c71ad5fe1a369e7f6fd79837b88..53a6a0a836b5c0a2a782c4e85745385e6dc5f733 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -813,10 +813,13 @@ void PictureLayerImpl::AddTilingsForRasterScale() {
   if (!high_res) {
     // We always need a high res tiling, so create one if it doesn't exist.
     high_res = AddTiling(raster_contents_scale_);
-  } else if (high_res->was_ever_low_resolution()) {
+  } else if (high_res->may_contain_low_resolution_tiles()) {
     // If the tiling we find here was LOW_RESOLUTION previously, it may not be
     // fully rastered, so destroy the old tiles.
     high_res->Reset();
+    // Reset the flag now that we'll make it high res, it will have fully
+    // rastered content.
+    high_res->reset_may_contain_low_resolution_tiles();
   }
   high_res->set_resolution(HIGH_RESOLUTION);