Add "create_bundle" target in order to support bundle with gn.

tools/gn/ninja_target_writer.cc

Index: tools/gn/ninja_target_writer.cc
diff --git a/tools/gn/ninja_target_writer.cc b/tools/gn/ninja_target_writer.cc
index bb5a4530117c750b8e31613f6a9920ee28094795..486930bd2ffeb224f6985d16860ee42c2431a8ce 100644
--- a/tools/gn/ninja_target_writer.cc
+++ b/tools/gn/ninja_target_writer.cc
@@ -15,6 +15,7 @@
 #include "tools/gn/ninja_binary_target_writer.h"
 #include "tools/gn/ninja_bundle_data_target_writer.h"
 #include "tools/gn/ninja_copy_target_writer.h"
+#include "tools/gn/ninja_create_bundle_target_writer.h"
 #include "tools/gn/ninja_group_target_writer.h"
 #include "tools/gn/ninja_utils.h"
 #include "tools/gn/output_file.h"
@@ -61,6 +62,9 @@ void NinjaTargetWriter::RunAndWriteFile(const Target* target) {
   if (target->output_type() == Target::BUNDLE_DATA) {
     NinjaBundleDataTargetWriter writer(target, file);
     writer.Run();
+  } else if (target->output_type() == Target::CREATE_BUNDLE) {
+    NinjaCreateBundleTargetWriter writer(target, file);
+    writer.Run();
   } else if (target->output_type() == Target::COPY_FILES) {
     NinjaCopyTargetWriter writer(target, file);
     writer.Run();
@@ -165,11 +169,10 @@ OutputFile NinjaTargetWriter::WriteInputDepsStampAndGetDep(
   for (const auto& input : target_->inputs())
     input_deps_sources.push_back(&input);
 
-  // For an action (where we run a script only once) and bundle_data target the
-  // sources are the same as the inputs. For action_foreach, the sources will
-  // be operated on separately so don't handle them here.
-  if (target_->output_type() == Target::ACTION ||
-      target_->output_type() == Target::BUNDLE_DATA) {
+  // For an action (where we run a script only once) the sources are the same
+  // as the inputs. For action_foreach, the sources will be operated on
+  // separately so don't handle them here.
+  if (target_->output_type() == Target::ACTION) {
     for (const auto& source : target_->sources())
       input_deps_sources.push_back(&source);
   }