Observe adding external extensions via windows registry.

extensions/browser/external_extension_install_info.h

+// 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.
+
+#ifndef EXTENSIONS_BROWSER_EXTERNAL_EXTENSION_INSTALL_INFO_H_
+#define EXTENSIONS_BROWSER_EXTERNAL_EXTENSION_INSTALL_INFO_H_
+
+#include "base/files/file_path.h"
+#include "base/memory/scoped_vector.h"
+#include "base/version.h"
+#include "extensions/common/manifest.h"
+#include "url/gurl.h"
+
+namespace extensions {
+
+struct ExternalExtensionInstallInfo {

[asargent_no_longer_on_chrome, 2016/01/25 18:50:52]

suggestion: consider removing "Extension" from this struct name to make it
shorter, since its connection with extensions can be inferred from it being in
the extensions namespace


(and same suggestion for ExternalExtensionInstallInfoFile and
ExternalExtensionInstallInfoUpdateUrl below)

[lazyboy, 2016/01/26 05:20:04]

Thanks.
Done.

+  ExternalExtensionInstallInfo(const std::string& extension_id,
+                               int creation_flags,
+                               bool mark_acknowledged);
+  virtual ~ExternalExtensionInstallInfo() {}
+
+  std::string extension_id;
+  int creation_flags;
+  bool mark_acknowledged;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ExternalExtensionInstallInfo);
+};
+
+struct ExternalExtensionInstallInfoFile : public ExternalExtensionInstallInfo {
+  ExternalExtensionInstallInfoFile(const std::string& extension_id,
+                                   scoped_ptr<base::Version> version,
+                                   const base::FilePath& path,
+                                   Manifest::Location crx_location,
+                                   int creation_flags,
+                                   bool mark_acknowledged,
+                                   bool install_immediately);
+  ~ExternalExtensionInstallInfoFile() override;
+
+  scoped_ptr<base::Version> version;
+  base::FilePath path;
+  Manifest::Location crx_location;
+  bool install_immediately;
+};
+
+struct ExternalExtensionInstallInfoUpdateUrl
+    : public ExternalExtensionInstallInfo {
+  ExternalExtensionInstallInfoUpdateUrl(const std::string& extension_id,
+                                        const std::string& install_parameter,
+                                        scoped_ptr<GURL> update_url,
+                                        Manifest::Location download_location,
+                                        int creation_flags,
+                                        bool mark_acknowledged);
+  ~ExternalExtensionInstallInfoUpdateUrl() override;
+
+  std::string install_parameter;
+  scoped_ptr<GURL> update_url;
+  Manifest::Location download_location;
+};
+
+}  // namespace extensions
+#endif  // EXTENSIONS_BROWSER_EXTERNAL_EXTENSION_INSTALL_INFO_H_