Consider bundle_data as public_deps of create_bundle targets.

tools/gn/bundle_data.h

 // Copyright 2016 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.
 
 #ifndef TOOLS_GN_BUNDLE_DATA_H_
 #define TOOLS_GN_BUNDLE_DATA_H_
 
 #include <string>
 #include <vector>
 
 #include "tools/gn/bundle_file_rule.h"
+#include "tools/gn/unique_vector.h"
 
 class OutputFile;
 class SourceFile;
 class Settings;
 class Target;
 
 // Returns true if |source| correspond to the path of a file in an asset
 // catalog. If defined |asset_catalog| is set to its path.
 //
 // An asset catalog is an OS X bundle with the ".xcassets" extension. It
@@ skipping 47 matching lines @@
 
   std::string& resources_dir() { return resources_dir_; }
   const std::string& resources_dir() const { return resources_dir_; }
 
   std::string& executable_dir() { return executable_dir_; }
   const std::string& executable_dir() const { return executable_dir_; }
 
   std::string& plugins_dir() { return plugins_dir_; }
   const std::string& plugins_dir() const { return plugins_dir_; }
 
+  UniqueVector<const Target*>& deps() { return deps_; }

[brettw, 2016/03/21 22:49:47]

Can you call this "bundle_deps" and comment that these are the recursive
collection of bundle_data targets that this target depends on?

[sdefresne, 2016/03/22 12:34:05]

done.

+  const UniqueVector<const Target*>& deps() const { return deps_; }
+
  private:
   std::vector<SourceFile> asset_catalog_sources_;
   std::vector<BundleFileRule> file_rules_;
+  UniqueVector<const Target*> deps_;
 
   // All those values are subdirectories relative to root_build_dir, and apart
   // from root_dir, they are either equal to root_dir_ or subdirectories of it.
   std::string root_dir_;
   std::string resources_dir_;
   std::string executable_dir_;
   std::string plugins_dir_;
 };
 
 #endif  // TOOLS_GN_BUNDLE_DATA_H_