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

tools/gn/copy_target_generator.cc

Index: tools/gn/copy_target_generator.cc
diff --git a/tools/gn/copy_target_generator.cc b/tools/gn/copy_target_generator.cc
index 994011e824e614e5bdb5660d1a501fe2af7d5c64..bd3ef176dd1458c1cf3b9851cd22d823a7f4e391 100644
--- a/tools/gn/copy_target_generator.cc
+++ b/tools/gn/copy_target_generator.cc
@@ -42,3 +42,30 @@ void CopyTargetGenerator::DoRun() {
     return;
   }
 }
+
+CopyBundleDataTargetGenerator::CopyBundleDataTargetGenerator(

[brettw, 2016/01/20 22:23:17]

I don't like having this one class in the same file as another when nothing else
works this way.

If you feel like a separate file is too stupid, we can pass the target type in
the constructor and have the copy class do both things (the binary target writer
does this).

Actually, since the ninja target writer is shared with the regular copy target
type, the generator should probably be the same class also.

[sdefresne, 2016/01/21 22:00:56]

Merged.

+    Target* target,
+    Scope* scope,
+    const FunctionCallNode* function_call,
+    Err* err)
+    : TargetGenerator(target, scope, function_call, err) {
+}
+
+CopyBundleDataTargetGenerator::~CopyBundleDataTargetGenerator() {
+}
+
+void CopyBundleDataTargetGenerator::DoRun() {
+  target_->set_output_type(Target::COPY_BUNDLE_DATA);
+
+  if (!FillOutputs(true))
+    return;
+
+  if (target_->action_values().outputs().list().size() != 1) {
+    *err_ = Err(function_call_, "Copy command must have exactly one output.",
+        "You must specify exactly one value in the \"outputs\" array for the "
+        "destination of the copy\n(see \"gn help copy\"). If there are "
+        "multiple sources to copy, use source expansion\n(see \"gn help "
+        "source_expansion\").");
+    return;
+  }
+}