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

tools/gn/target.cc

Index: tools/gn/target.cc
diff --git a/tools/gn/target.cc b/tools/gn/target.cc
index 7dd192181ea891e96aa6a9762470fc63af02496e..a0bd986a563c19f07e622d800d69754b922dd025 100644
--- a/tools/gn/target.cc
+++ b/tools/gn/target.cc
@@ -218,6 +218,8 @@ const char* Target::GetStringForOutputType(OutputType type) {
       return "Source set";
     case COPY_FILES:
       return "Copy";
+    case COPY_BUNDLE_DATA:
+      return "Copy bundle data";
     case ACTION:
       return "Action";
     case ACTION_FOREACH:
@@ -275,6 +277,7 @@ bool Target::OnResolved(Err* err) {
     all_libs_.append(cur.libs().begin(), cur.libs().end());
   }
 
+  PullRecursiveBundleData();
   PullDependentTargetLibs();
   PullRecursiveHardDeps();
   if (!ResolvePrecompiledHeaders(err))
@@ -316,6 +319,7 @@ bool Target::IsFinal() const {
          output_type_ == ACTION ||
          output_type_ == ACTION_FOREACH ||
          output_type_ == COPY_FILES ||
+         output_type_ == COPY_BUNDLE_DATA ||
          (output_type_ == STATIC_LIBRARY && complete_static_lib_);
 }
 
@@ -474,6 +478,33 @@ void Target::PullRecursiveHardDeps() {
   }
 }
 
+void Target::PullRecursiveBundleData() {
+  for (const auto& pair : GetDeps(DEPS_LINKED)) {
+    if (pair.ptr->output_type() == EXECUTABLE ||
+        pair.ptr->output_type() == SHARED_LIBRARY ||
+        pair.ptr->output_type() == LOADABLE_MODULE ||
+        pair.ptr->output_type() == COPY_BUNDLE_DATA)
+      continue;
+
+    bundle_data_.insert(pair.ptr->bundle_data().begin(),
+                        pair.ptr->bundle_data().end());
+  }
+
+  if (output_type_ != COPY_BUNDLE_DATA)
+    return;
+
+  const PatternList& filter = bundle_data_filter();
+  if (filter.is_empty()) {
+    sources_.insert(sources_.end(), bundle_data_.begin(), bundle_data_.end());
+  } else {
+    sources_.reserve(sources_.size() + bundle_data_.size());
+    for (const SourceFile& source_file : bundle_data_) {
+      if (!filter.MatchesString(source_file.value()))
+        sources_.push_back(source_file);
+    }
+  }
+}
+
 void Target::FillOutputFiles() {
   const Tool* tool = toolchain_->GetToolForTargetFinalOutput(this);
   bool check_tool_outputs = false;
@@ -481,6 +512,7 @@ void Target::FillOutputFiles() {
     case GROUP:
     case SOURCE_SET:
     case COPY_FILES:
+    case COPY_BUNDLE_DATA:
     case ACTION:
     case ACTION_FOREACH: {
       // These don't get linked to and use stamps which should be the first