Drive: Mount/Unmount GoogleDrive on Files App when the file system is mounted/unmounted.

chrome/browser/chromeos/gdata/gdata_file_system.h

 // 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_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 190 matching lines @@
   virtual ~GDataFileSystem();
 
   // GDataFileSystem overrides.
   virtual void Initialize() OVERRIDE;
   virtual void AddObserver(
       GDataFileSystemInterface::Observer* observer) OVERRIDE;
   virtual void RemoveObserver(
       GDataFileSystemInterface::Observer* observer) OVERRIDE;
   virtual void StartUpdates() OVERRIDE;
   virtual void StopUpdates() OVERRIDE;
+  virtual void NotifyFileSystemMounted() OVERRIDE;
+  virtual void NotifyFileSystemToBeUnmounted() OVERRIDE;
   virtual void CheckForUpdates() OVERRIDE;
   virtual void GetEntryInfoByResourceId(
       const std::string& resource_id,
       const GetEntryInfoWithFilePathCallback& callback) OVERRIDE;
   virtual void Search(const std::string& search_query,
                       const SearchCallback& callback) OVERRIDE;
   virtual void TransferFileFromRemoteToLocal(
       const FilePath& remote_src_file_path,
       const FilePath& local_dest_file_path,
       const FileOperationCallback& callback) OVERRIDE;
@@ skipping 742 matching lines @@
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<GDataFileSystem> ui_weak_ptr_factory_;
   // Unlike other classes, we need this as we need this to redirect a task
   // from IO thread to UI thread.
   base::WeakPtr<GDataFileSystem> ui_weak_ptr_;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_