Fix blurry content after disabling dev tools emulation

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 8e23b7784f1810fa1188df72aab8d2245c4b1db1..9ae1138aa87c3ebd4c372037af0d5ae5597827cd 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -497,6 +497,11 @@ void LayerTreeImpl::MoveChangeTrackingToLayers() {
   }
 }
 
+void LayerTreeImpl::ForceRecalculateRasterScales() {
+  for (auto* layer : picture_layers_)
+    layer->ResetRasterScale();
+}
+
 LayerImplList::const_iterator LayerTreeImpl::begin() const {
   return layer_list_.cbegin();
 }