Add support for data deps.

tools/gn/target.h

Index: tools/gn/target.h
diff --git a/tools/gn/target.h b/tools/gn/target.h
index 63d62ae27174f48865c5bb950aadc31f95cc8d1f..ac0fc59c908c6c40bfb5e816f501ec3763f075cc 100644
--- a/tools/gn/target.h
+++ b/tools/gn/target.h
@@ -64,9 +64,14 @@ class Target : public Item {
   const FileList& data() const { return data_; }
   void swap_in_data(FileList* d) { data_.swap(*d); }
 
+  // Linked dependencies.
   const std::vector<const Target*>& deps() const { return deps_; }
   void swap_in_deps(std::vector<const Target*>* d) { deps_.swap(*d); }
 
+  // Non-linked dependencies.
+  const std::vector<const Target*>& datadeps() const { return datadeps_; }
+  void swap_in_datadeps(std::vector<const Target*>* d) { datadeps_.swap(*d); }
+
   // List of configs that this class inherits settings from.
   const std::vector<const Config*>& configs() const { return configs_; }
   void swap_in_configs(std::vector<const Config*>* c) { configs_.swap(*c); }
@@ -118,6 +123,7 @@ class Target : public Item {
   FileList sources_;
   FileList data_;
   std::vector<const Target*> deps_;
+  std::vector<const Target*> datadeps_;
   std::vector<const Config*> configs_;
   std::vector<const Config*> all_dependent_configs_;
   std::vector<const Config*> direct_dependent_configs_;