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

tools/gn/functions_target.cc

Index: tools/gn/functions_target.cc
diff --git a/tools/gn/functions_target.cc b/tools/gn/functions_target.cc
index b04fea8b0f49d56c9121ac9b7432f27aad272751..a264db862fc0347baad1407a3a64877922095e5a 100644
--- a/tools/gn/functions_target.cc
+++ b/tools/gn/functions_target.cc
@@ -18,8 +18,9 @@
 #define DEPS_VARS \
     "  Deps: data_deps, deps, public_deps\n"
 #define GENERAL_TARGET_VARS \
-    "  General: check_includes, configs, data, inputs, output_name,\n" \
-    "           output_extension, public, sources, testonly, visibility\n"
+    "  General: bundle_data, check_includes, configs, data, inputs,\n" \
+    "           output_name, output_extension, public, sources, testonly,\n" \
+    "           visibility\n"
 
 namespace functions {
 
@@ -299,6 +300,34 @@ Value RunCopy(const FunctionCallNode* function,
   return Value();
 }
 
+// copy bundle data ------------------------------------------------------------
+
+const char kCopyBundleData[] = "copy_bundle_data";
+const char kCopyBundleData_HelpShort[] =
+    "copy_bundle_data: Declare a target that \"bundle_data\" files.";
+const char kCopyBundleData_Help[] =
+    "copy_bundle_data: Declare a target that \"bundle_data\" files.\n"
+    "\n"
+    "Similar to the \"copy\" target, but the list of file to copy comes from\n"
+    "the \"bundle_data\" property of all dependent targets (recursively). It\n"
+    "can be used to copy files required at runtime by the application into a\n"
+    "location where it can be found.\n"
+    "\n"
+    "See \"gn help copy\" for more information.\n";
+
+
+Value RunCopyBundleData(const FunctionCallNode* function,
+                        const std::vector<Value>& args,
+                        Scope* scope,
+                        Err* err) {
+  if (!EnsureNotProcessingImport(function, scope, err) ||
+      !EnsureNotProcessingBuildConfig(function, scope, err))
+    return Value();
+  TargetGenerator::GenerateTarget(scope, function, args,
+                                  functions::kCopyBundleData, err);
+  return Value();
+}
+
 // executable ------------------------------------------------------------------
 
 const char kExecutable[] = "executable";