Upstream most of the iOS WebUI support in ios/web/

ios/web/webui/shared_resources_data_source_ios.h

+// Copyright 2014 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.
+
+#ifndef IOS_WEB_WEBUI_SHARED_RESOURCES_DATA_SOURCE_IOS_H_
+#define IOS_WEB_WEBUI_SHARED_RESOURCES_DATA_SOURCE_IOS_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ios/web/public/url_data_source_ios.h"
+
+namespace web {
+
+// A DataSource for chrome://resources/ URLs.
+class SharedResourcesDataSourceIOS : public URLDataSourceIOS {
+ public:
+  SharedResourcesDataSourceIOS();
+
+  // web::URLDataSourceIOS implementation.
+  std::string GetSource() const override;
+  void StartDataRequest(
+      const std::string& path,
+      const URLDataSourceIOS::GotDataCallback& callback) override;
+  std::string GetMimeType(const std::string&) const override;
+
+ private:
+  ~SharedResourcesDataSourceIOS() override;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedResourcesDataSourceIOS);
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_WEBUI_SHARED_RESOURCES_DATA_SOURCE_IOS_H_