Extract external file systems handling from isolated context.

webkit/fileapi/mount_points.h

Index: webkit/fileapi/mount_points.h
diff --git a/webkit/fileapi/mount_points.h b/webkit/fileapi/mount_points.h
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+// 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 WEBKIT_FILEAPI_MOUNT_POINTS_H_
+#define WEBKIT_FILEAPI_MOUNT_POINTS_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "webkit/fileapi/file_system_util.h"
+#include "webkit/storage/webkit_storage_export.h"
+
+class GURL;
+
+namespace fileapi {
+
+// Represents a set of mount points for File API.
+class WEBKIT_STORAGE_EXPORT MountPoints {
+ public:
+  struct WEBKIT_STORAGE_EXPORT MountPointInfo {
+    MountPointInfo();
+    MountPointInfo(const std::string& name, const FilePath& path);
+
+    // The name to be used to register the path. The registered file can
+    // be referred by a virtual path /<filesystem_id>/<name>.
+    // The name should NOT contain a path separator '/'.
+    std::string name;
+
+    // The path of the file.
+    FilePath path;
+
+    // For STL operation.
+    bool operator<(const MountPointInfo& that) const {
+      return name < that.name;
+    }
+  };
+
+  MountPoints() {}
+  virtual ~MountPoints() {}
+
+  // Returns true if the MountPoints implementation can crack FileSystemURL
+  // with given mount type.
+  virtual bool CanCrackMountType(FileSystemType type) const = 0;
+
+  // Returns the mount point root path registered for a given |mount_name|.
+  // Returns false if the given |mount_name| is not valid.
+  virtual bool GetRegisteredPath(const std::string& mount_name,
+                                 FilePath* path) const = 0;
+
+  // TODO(tbarzic): Add CrackURL methods here.
+
+  // Revokes a mount point identified by |mount_name|.
+  // Returns false if the |mount_name| is not (no longer) registered.
+  // TODO(kinuko): Probably this should be rather named RevokeMountPoint.
+  virtual bool RevokeFileSystem(const std::string& mount_name) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MountPoints);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_MOUNT_POINTS_H_