Add support for Mac/iOS application bundles to GN tool.

tools/gn/target.h

Index: tools/gn/target.h
diff --git a/tools/gn/target.h b/tools/gn/target.h
index cbdab35761ef8e77c545921b5e958743b271951b..40af8f99793c7a11d8b3201e11357c1c50d2c6d2 100644
--- a/tools/gn/target.h
+++ b/tools/gn/target.h
@@ -41,6 +41,7 @@ class Target : public Item {
     STATIC_LIBRARY,
     SOURCE_SET,
     COPY_FILES,
+    COPY_BUNDLE_DATA,
     ACTION,
     ACTION_FOREACH,
   };
@@ -134,6 +135,12 @@ class Target : public Item {
   const std::vector<std::string>& data() const { return data_; }
   std::vector<std::string>& data() { return data_; }
 
+  // Runtime file dependency for bundled application (Mac/iOS). Those files
+  // are collected recursively (breaking at executable, shared library and
+  // loadable modules).
+  const std::set<SourceFile>& bundle_data() const { return bundle_data_; }
+  std::set<SourceFile>& bundle_data() { return bundle_data_; }
+
   // Returns true if targets depending on this one should have an order
   // dependency.
   bool hard_dep() const {
@@ -272,6 +279,7 @@ class Target : public Item {
   void PullDependentTargetLibsFrom(const Target* dep, bool is_public);
   void PullDependentTargetLibs();
   void PullRecursiveHardDeps();
+  void PullRecursiveBundleData();
 
   // Fills the link and dependency output files when a target is resolved.
   void FillOutputFiles();
@@ -298,6 +306,7 @@ class Target : public Item {
   bool complete_static_lib_;
   bool testonly_;
   FileList inputs_;
+  std::set<SourceFile> bundle_data_;
   std::vector<std::string> data_;
 
   LabelTargetVector private_deps_;