Add support for (de)serializing HeadsUpDisplayLayer

cc/layers/layer_proto_converter.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer_proto_converter.h"
 
 #include "base/stl_util.h"
 #include "cc/layers/empty_content_layer_client.h"
+#include "cc/layers/heads_up_display_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_settings.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/proto/layer.pb.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_settings.h"
 
 namespace cc {
 
 LayerProtoConverter::LayerProtoConverter() {}
@@ skipping 90 matching lines @@
   switch (proto.type()) {
     // Fall through and build a base layer.  This won't have any special layer
     // properties but still maintains the layer hierarchy if we run into a
     // layer type we don't support.
     case proto::UNKNOWN:
     case proto::LAYER:
       return Layer::Create(LayerSettings()).get();
     case proto::PICTURE_LAYER:
       return PictureLayer::Create(LayerSettings(),
                                   EmptyContentLayerClient::GetInstance());
+    case proto::HEADS_UP_DISPLAY_LAYER:
+      return HeadsUpDisplayLayer::Create(LayerSettings());
   }
   // TODO(nyquist): Add the rest of the necessary LayerTypes. This function
   // should not return null.
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace cc