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

chrome/browser/chromeos/gdata/gdata_file_system_interface.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_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 89 matching lines @@
     // Triggered when the file system is initially loaded.
     virtual void OnInitialLoadFinished() {}
 
     // Triggered when a document feed is fetched. |num_accumulated_entries|
     // tells the number of entries fetched so far.
     virtual void OnDocumentFeedFetched(int num_accumulated_entries) {}
 
     // Triggered when the feed from the server is loaded.
     virtual void OnFeedFromServerLoaded() {}
 
+    // Triggered when the file system is mounted.
+    virtual void OnFileSystemMounted() {}
+    // Triggered when the file system is being unmounted.
+    virtual void OnFileSystemBeingUnmounted() {}
+
    protected:
     virtual ~Observer() {}
   };
 
   // Initializes the object. This function should be called before any
   // other functions.
   virtual void Initialize() = 0;
 
   // Adds and removes the observer.
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Starts and stops periodic updates.
   virtual void StartUpdates() = 0;
   virtual void StopUpdates() = 0;
 
+  // Notifies the file system was just mounted.
+  virtual void NotifyFileSystemMounted() = 0;
+
+  // Notifies the file system is going to be unmounted.
+  virtual void NotifyFileSystemToBeUnmounted() = 0;
+
   // Checks for updates on the server.
   virtual void CheckForUpdates() = 0;
 
   // Finds an entry (file or directory) by using |resource_id|. This call
   // does not initiate content refreshing.
   //
   // Can be called from UI/IO thread. |callback| is run on the calling thread.
   virtual void GetEntryInfoByResourceId(
       const std::string& resource_id,
       const GetEntryInfoWithFilePathCallback& callback) = 0;
@@ skipping 205 matching lines @@
                                const FilePath& virtual_dir_path,
                                scoped_ptr<DocumentEntry> entry,
                                const FilePath& file_content_path,
                                GDataCache::FileOperationType cache_operation,
                                const base::Closure& callback) = 0;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_INTERFACE_H_