Implement a module system for the extension bindings JS.

chrome/renderer/resource_bundle_source_map.cc

Index: chrome/renderer/resource_bundle_source_map.cc
diff --git a/chrome/renderer/resource_bundle_source_map.cc b/chrome/renderer/resource_bundle_source_map.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2c06b7b318adfcee1ffaa8b70dabbe4fe7d73a89
--- /dev/null
+++ b/chrome/renderer/resource_bundle_source_map.cc
@@ -0,0 +1,40 @@
+// Copyright (c) 2012 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 "chrome/renderer/resource_bundle_source_map.h"
+
+#include "ui/base/resource/resource_bundle.h"
+
+ResourceBundleSourceMap::ResourceBundleSourceMap(
+    const ui::ResourceBundle* resource_bundle)
+    : resource_bundle_(resource_bundle) {
+}
+
+ResourceBundleSourceMap::~ResourceBundleSourceMap() {
+}
+
+void ResourceBundleSourceMap::RegisterSource(const std::string& name,
+                                             int resource_id) {
+  resource_id_map_[name] = resource_id;
+}
+
+v8::Handle<v8::Value> ResourceBundleSourceMap::GetSource(
+    const std::string& name) {
+  if (!Contains(name))
+    return v8::Undefined();
+  int resource_id = resource_id_map_[name];
+  return ConvertString(resource_bundle_->GetRawDataResource(resource_id));
+}
+
+bool ResourceBundleSourceMap::Contains(const std::string& name) {
+  return resource_id_map_.count(name) > 0;
+}
+
+v8::Handle<v8::String> ResourceBundleSourceMap::ConvertString(
+    const base::StringPiece& string) {
+  // v8 takes ownership of the StaticV8ExternalAsciiStringResource (see
+  // v8::String::NewExternal()).
+  return v8::String::NewExternal(
+      new StaticV8ExternalAsciiStringResource(string));
+}