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

tools/gn/bundle_data.cc

Index: tools/gn/bundle_data.cc
diff --git a/tools/gn/bundle_data.cc b/tools/gn/bundle_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7bc260c7cad28206877896abbaedff9b466a7804
--- /dev/null
+++ b/tools/gn/bundle_data.cc
@@ -0,0 +1,114 @@
+// Copyright 2016 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/bundle_data.h"
+
+#include "base/logging.h"
+#include "tools/gn/output_file.h"
+#include "tools/gn/settings.h"
+#include "tools/gn/target.h"
+
+namespace {
+
+// Return directory of |path| without the trailing directory separator.
+base::StringPiece FindDirNoTrailingSeparator(const base::StringPiece& path) {
+  base::StringPiece::size_type pos = path.find_last_of("/\\");
+  if (pos == base::StringPiece::npos)
+    return base::StringPiece();
+  return base::StringPiece(path.data(), pos);
+}
+
+}  // namespace
+
+// Returns true if |source| correspond to the path of a file in an asset
+// catalog.
+//
+// An asset catalog is a bundle with the ".xcassets" extension. It contains
+// one directory per asset each of them with the ".imageset" extension.
+//
+// As an approximation, this function checks whether source matches:
+//    .*\.xcassets/[^/]*\.imageset/[^/]*
+bool IsSourceFileFromAssetCatalog(const SourceFile& source,
+                                  SourceFile* asset_catalog) {
+  base::StringPiece dir;
+  dir = FindDirNoTrailingSeparator(source.value());
+  if (!dir.ends_with(".imageset"))
+    return false;
+  dir = FindDirNoTrailingSeparator(dir);
+  if (!dir.ends_with(".xcassets"))
+    return false;
+  if (asset_catalog) {
+    std::string asset_catalog_path = dir.as_string();
+    *asset_catalog = SourceFile(SourceFile::SWAP_IN, &asset_catalog_path);
+  }
+  return true;
+}
+
+BundleData::BundleData() {}
+
+BundleData::~BundleData() {}
+
+void BundleData::AddFileRuleFromTarget(const Target* target) {
+  DCHECK_EQ(target->output_type(), Target::BUNDLE_DATA);
+
+  std::vector<SourceFile> file_rule_sources;
+  for (const SourceFile& source_file : target->sources()) {
+    if (IsSourceFileFromAssetCatalog(source_file, nullptr)) {
+      asset_catalog_sources_.push_back(source_file);
+    } else {
+      file_rule_sources.push_back(source_file);
+    }
+  }
+
+  DCHECK_EQ(target->action_values().outputs().list().size(), 1u);
+  file_rules_.push_back(
+      BundleFileRule(file_rule_sources,
+                     target->action_values().outputs().list()[0]));
+}
+
+
+void BundleData::GetSourceFiles(std::vector<SourceFile>* sources) const {
+  DCHECK(sources);
+  for (const BundleFileRule& file_rule : file_rules_) {
+    sources->insert(sources->end(),
+                    file_rule.sources().begin(),
+                    file_rule.sources().end());
+  }
+  sources->insert(sources->end(),
+                  asset_catalog_sources_.begin(),
+                  asset_catalog_sources_.end());
+}
+
+void BundleData::GetOutputFiles(const Settings* settings,
+                                std::vector<OutputFile>* outputs) const {
+  DCHECK(settings);
+  DCHECK(outputs);
+  std::vector<SourceFile> outputs_as_sources;
+  GetOutputsAsSourceFiles(settings, &outputs_as_sources);
+  for (const SourceFile& source_file : outputs_as_sources) {
+    outputs->push_back(OutputFile(settings->build_settings(), source_file));
+  }
+}
+
+void BundleData::GetOutputsAsSourceFiles(
+    const Settings* settings,
+    std::vector<SourceFile>* outputs_as_source) const {
+  DCHECK(settings);
+  DCHECK(outputs_as_source);
+  for (const BundleFileRule& file_rule : file_rules_) {
+    for (const SourceFile& source : file_rule.sources()) {
+      outputs_as_source->push_back(file_rule.ApplyPatternToSource(
+          settings, *this, source));
+    }
+  }
+
+  if (!asset_catalog_sources_.empty())
+    outputs_as_source->push_back(GetCompiledAssetCatalogPath());
+}
+
+SourceFile BundleData::GetCompiledAssetCatalogPath() const {
+  DCHECK(!asset_catalog_sources_.empty());
+  std::string assets_car_path = resources_dir_ + "/Assets.car";
+  return SourceFile(SourceFile::SWAP_IN, &assets_car_path);
+}