Revert of Move file_handlers API from //chrome to //extensions

chrome/browser/extensions/api/file_handlers/app_file_handler_util.h

Index: chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
diff --git a/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h b/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..28d19db19486cb3a51b3471aa561e805adc3a0b2
--- /dev/null
+++ b/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
@@ -0,0 +1,79 @@
+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_APP_FILE_HANDLER_UTIL_H_
+#define CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_APP_FILE_HANDLER_UTIL_H_
+
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/callback.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest_handlers/file_handler_info.h"
+
+class Profile;
+
+namespace extensions {
+
+struct EntryInfo;
+struct FileHandlerInfo;
+struct GrantedFileEntry;
+
+// TODO(benwells): move this to platform_apps namespace.
+namespace app_file_handler_util {
+
+extern const char kInvalidParameters[];
+extern const char kSecurityError[];
+
+// Returns the file handler with the specified |handler_id|, or NULL if there
+// is no such handler.
+const FileHandlerInfo* FileHandlerForId(const Extension& app,
+                                        const std::string& handler_id);
+
+// Returns the handlers that can handle all files in |entries|.
+std::vector<const FileHandlerInfo*> FindFileHandlersForEntries(
+    const Extension& extension,
+    const std::vector<EntryInfo> entries);
+
+bool FileHandlerCanHandleEntry(const FileHandlerInfo& handler,
+                               const EntryInfo& entry);
+
+// Creates a new file entry and allows |renderer_id| to access |path|. This
+// registers a new file system for |path|.
+GrantedFileEntry CreateFileEntry(Profile* profile,
+                                 const Extension* extension,
+                                 int renderer_id,
+                                 const base::FilePath& path,
+                                 bool is_directory);
+
+// |directory_paths| contain the set of directories out of |paths|.
+// For directories it makes sure they exist at their corresponding |paths|,
+// while for regular files it makes sure they exist (i.e. not links) at |paths|,
+// creating files if needed. If result is successful it calls |on_success|,
+// otherwise calls |on_failure|.
+void PrepareFilesForWritableApp(
+    const std::vector<base::FilePath>& paths,
+    Profile* profile,
+    const std::set<base::FilePath>& directory_paths,
+    const base::Closure& on_success,
+    const base::Callback<void(const base::FilePath&)>& on_failure);
+
+// Returns whether |extension| has the fileSystem.write permission.
+bool HasFileSystemWritePermission(const Extension* extension);
+
+// Validates a file entry and populates |file_path| with the absolute path if it
+// is valid.
+bool ValidateFileEntryAndGetPath(const std::string& filesystem_name,
+                                 const std::string& filesystem_path,
+                                 int render_process_id,
+                                 base::FilePath* file_path,
+                                 std::string* error);
+
+}  // namespace app_file_handler_util
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_APP_FILE_HANDLER_UTIL_H_