Adding `browsing_data_filesystem_helper*` as the first step towards content settings UI.

chrome/browser/browsing_data_file_system_helper.h

+// Copyright (c) 2011 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_BROWSING_DATA_FILE_SYSTEM_HELPER_H_
+#define CHROME_BROWSER_BROWSING_DATA_FILE_SYSTEM_HELPER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/callback_old.h"
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "base/time.h"
+#include "chrome/common/url_constants.h"
+#include "googleurl/src/gurl.h"
+#include "webkit/fileapi/file_system_types.h"
+
+class Profile;
+
+// BrowsingDataFileSystemHelper is an interface for classes dealing with
+// aggregating and deleting browsing data stored in local filesystems.  A
+// client of this class needs to call StartFetching from the UI thread to
+// initiate the flow, and it'll be notified by the callback in its UI thread at
+// some later point.  The client must call CancelNotification() if it's
+// destroyed before the callback is notified.
+class BrowsingDataFileSystemHelper
+    : public base::RefCountedThreadSafe<BrowsingDataFileSystemHelper> {
+ public:
+  // Contains detailed information about a filesystem
+  struct FileSystemInfo {
+    FileSystemInfo(
+        const GURL& origin,
+        bool has_persistent,
+        bool has_temporary);
+    ~FileSystemInfo();
+
+    bool IsFileSchemeData() {
+      return origin.scheme() == chrome::kFileScheme;
+    }
+
+    GURL origin;
+    bool has_persistent;
+    bool has_temporary;
+  };
+
+  // Create a BrowsingDataFileSystemHelper instance for the filesystems
+  // stored in |profile|'s user data directory.
+  static BrowsingDataFileSystemHelper* Create(Profile* profile);
+
+  // Starts the fetching process, which will notify its completion via
+  // callback.
+  // This must be called only in the UI thread.
+  virtual void StartFetching(
+      Callback1<const std::vector<FileSystemInfo>& >::Type* callback) = 0;
+  // Cancels the notification callback (i.e., the window that created it no
+  // longer exists).
+  // This must be called only in the UI thread.
+  virtual void CancelNotification() = 0;
+  // Requests a single filesystem to be deleted in the FILE thread.
+  virtual void DeleteFileSystemOrigin(const GURL& origin) = 0;
+
+  virtual ~BrowsingDataFileSystemHelper() {}

[kinuko, 2011/05/25 10:24:41]

does this destructor need to be public?

[Mike West, 2011/05/25 12:00:01]

Probably not.

+ protected:
+  friend class base::RefCountedThreadSafe<BrowsingDataFileSystemHelper>;
+};
+
+// This class is an implementation of BrowsingDataFileSystemHelper that does
+// not fetch its information from the filesystem tracker, but gets it passed
+// in as a parameter.
+class CannedBrowsingDataFileSystemHelper
+    : public BrowsingDataFileSystemHelper {
+ public:
+  explicit CannedBrowsingDataFileSystemHelper(Profile* profile);
+
+  // Return a copy of the filesystem helper. Only one consumer can use the
+  // StartFetching method at a time, so we need to create a copy of the helper
+  // everytime we instantiate a cookies tree model for it.
+  CannedBrowsingDataFileSystemHelper* Clone();
+
+  // Add a filesystem to the set of canned filesystems that is
+  // returned by this helper.
+  void AddFileSystem(const GURL& origin,
+                     fileapi::FileSystemType type);
+
+  // Clear the list of canned filesystems.
+  void Reset();
+
+  // True if no filesystems are currently stored.
+  bool empty() const;
+
+  // BrowsingDataFileSystemHelper methods.
+  virtual void StartFetching(
+      Callback1<const std::vector<FileSystemInfo>& >::Type* callback);
+  virtual void CancelNotification() {}
+  virtual void DeleteFileSystemOrigin(const GURL& origin) {}
+
+ private:
+  struct PendingFileSystemInfo {
+    PendingFileSystemInfo();
+    PendingFileSystemInfo(const GURL& origin, fileapi::FileSystemType type);
+    ~PendingFileSystemInfo();
+
+    GURL origin;
+    fileapi::FileSystemType type;
+  };
+
+  virtual ~CannedBrowsingDataFileSystemHelper();
+
+  void ConvertPendingInfo();
+
+  void Notify();
+
+  Profile* profile_;
+
+  // Lock to protect access to pending_file_system_info_;
+  mutable base::Lock lock_;

[kinuko, 2011/05/25 10:24:41]

After all do we access pending_file_system_info_ other than on UI thread?  (I
might be missing something)

[Mike West, 2011/05/25 12:00:01]

Done.

+
+  std::vector<PendingFileSystemInfo> pending_file_system_info_;
+
+  std::vector<FileSystemInfo> file_system_info_;
+
+  scoped_ptr<Callback1<const std::vector<FileSystemInfo>& >::Type >
+      completion_callback_;
+
+  // Indicates whether or not we're currently fetching information:
+  // it's true when StartFetching() is called in the UI thread, and it's reset
+  // after we notified the callback in the UI thread.
+  // This only mutates on the UI thread.
+  bool is_fetching_;
+
+  DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataFileSystemHelper);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_FILE_SYSTEM_HELPER_H_