Cleaned up some compilation issues for the AnimGraphEditor.

src/AnimGraph/AnimGraphResource.h

@@ -107,6 +107,13 @@ struct BlendTreeResource {
     return result;
   }
 
+  bool IsSocketConnected(
+      const AnimNodeResource* source_node,
+      const std::string& socket_name) {
+    assert(false && "Not yet implemented");
+    return false;
+  }
+
   size_t GetNodeIndexForOutputSocket(const std::string& socket_name) const {
     for (size_t i = 0; i < m_connections.size(); i++) {
       const BlendTreeConnectionResource& connection = m_connections[i];
@@ -156,6 +163,7 @@ struct AnimGraphResource : AnimNodeResource {
   BlendTreeResource m_blend_tree_resource;
   StateMachineResource m_state_machine_resource;
 
+  void Clear() { m_blend_tree_resource.Reset(); }
   bool SaveToFile(const char* filename) const;
   bool LoadFromFile(const char* filename);