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

chrome/browser/chromeos/extensions/file_browser_event_router.h

Index: chrome/browser/chromeos/extensions/file_browser_event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.h b/chrome/browser/chromeos/extensions/file_browser_event_router.h
index 1e41f85b792179aa6a4d93ce0f640106428a0c34..78705768f2e7c149549f493b67b7d239877f9dad 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.h
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.h
@@ -52,6 +52,10 @@ class FileBrowserEventRouter
   void RemoveFileWatch(const FilePath& file_path,
                        const std::string& extension_id);
 
+  // Mounts Drive on File browser. |callback| will be called after raising a
+  // mount request event to file manager on JS-side.
+  void MountDrive(const base::Closure& callback);
+
   // CrosDisksClient::Observer overrides.
   virtual void DiskChanged(chromeos::disks::DiskMountManagerEventType event,
                            const chromeos::disks::DiskMountManager::Disk* disk)
@@ -82,6 +86,8 @@ class FileBrowserEventRouter
   // gdata::GDataFileSystemInterface::Observer overrides.
   virtual void OnDirectoryChanged(const FilePath& directory_path) OVERRIDE;
   virtual void OnDocumentFeedFetched(int num_accumulated_entries) OVERRIDE;
+  virtual void OnFileSystemMounted() OVERRIDE;
+  virtual void OnFileSystemUnmounting() OVERRIDE;
 
  private:
   friend class FileBrowserEventRouterFactory;
@@ -186,6 +192,11 @@ class FileBrowserEventRouter
   // zero.
   void HandleRemoteUpdateRequestOnUIThread(bool start);
 
+  // Used to implement MountDrive(). Called after the authentication.
+  void OnAuthenticated(const base::Closure& callback,
+                       gdata::GDataErrorCode error,
+                       const std::string& tokeni);
+
   scoped_refptr<FileWatcherDelegate> delegate_;
   WatcherMap file_watchers_;
   scoped_ptr<FileBrowserNotifications> notifications_;