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

tools/gn/test_with_scope.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/test_with_scope.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "tools/gn/parser.h"
@@ skipping 120 matching lines @@
   // STAMP
   scoped_ptr<Tool> stamp_tool(new Tool);
   SetCommandForTool("touch {{output}}", stamp_tool.get());
   toolchain->SetTool(Toolchain::TYPE_STAMP, std::move(stamp_tool));
 
   // COPY
   scoped_ptr<Tool> copy_tool(new Tool);
   SetCommandForTool("cp {{source}} {{output}}", copy_tool.get());
   toolchain->SetTool(Toolchain::TYPE_COPY, std::move(copy_tool));
 
+  // COPY_BUNDLE_DATA
+  scoped_ptr<Tool> copy_bundle_data_tool(new Tool);
+  SetCommandForTool("cp {{source}} {{output}}", copy_bundle_data_tool.get());
+  toolchain->SetTool(Toolchain::TYPE_COPY_BUNDLE_DATA,
+                     std::move(copy_bundle_data_tool));
+
+  // COMPILE_XCASSETS
+  scoped_ptr<Tool> compile_xcassets_tool(new Tool);
+  SetCommandForTool("touch {{output}}", compile_xcassets_tool.get());
+  toolchain->SetTool(Toolchain::TYPE_COMPILE_XCASSETS,
+                     std::move(compile_xcassets_tool));
+
   toolchain->ToolchainSetupComplete();
 }
 
 // static
 void TestWithScope::SetCommandForTool(const std::string& cmd, Tool* tool) {
   Err err;
   SubstitutionPattern command;
   command.Parse(cmd, nullptr, &err);
   CHECK(!err.has_error())
       << "Couldn't parse \"" << cmd << "\", " << "got " << err.message();
@@ skipping 20 matching lines @@
                        const std::string& label_string,
                        Target::OutputType type)
     : Target(setup.settings(), setup.ParseLabel(label_string)) {
   visibility().SetPublic();
   set_output_type(type);
   SetToolchain(setup.toolchain());
 }
 
 TestTarget::~TestTarget() {
 }