[Extensions Bindings] Add a bridge to use current custom bindings

extensions/renderer/string_source_map.h

+// Copyright 2016 The Chromium Authors. All rights reserved.

[Devlin, 2016/12/16 01:55:49]

This file and test_v8_extension_configuration are pretty much just moving stuff
- lemme know if you'd prefer it in a separate CL, and I'm happy to oblige. :)

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_RENDERER_STRING_SOURCE_MAP_H_
+#define EXTENSIONS_RENDERER_STRING_SOURCE_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "extensions/renderer/source_map.h"
+
+namespace extensions {
+
+// A testing implementation of the source map that takes strings for source
+// contents.
+class StringSourceMap : public SourceMap {
+ public:
+  StringSourceMap();
+  ~StringSourceMap() override;
+
+  // Adds a new string to be used in the source map.
+  void RegisterModule(const std::string& name, const std::string& source);
+
+  // SourceMap:
+  v8::Local<v8::String> GetSource(v8::Isolate* isolate,
+                                  const std::string& name) const override;
+  bool Contains(const std::string& name) const override;
+
+ private:
+  std::map<std::string, std::string> sources_;
+
+  DISALLOW_COPY_AND_ASSIGN(StringSourceMap);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_STRING_SOURCE_MAP_H_