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

chrome/browser/chromeos/gdata/gdata_file_system_interface.h

Index: chrome/browser/chromeos/gdata/gdata_file_system_interface.h
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system_interface.h b/chrome/browser/chromeos/gdata/gdata_file_system_interface.h
index 26c91e59dca98c8667e64f78b7a2f2469bac0c13..87623bcfd28109def9d608b5dc23339555389070 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system_interface.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system_interface.h
@@ -107,6 +107,11 @@ class GDataFileSystemInterface {
     // 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 getting unmounted.
+    virtual void OnFileSystemUnmounting() {}
+
    protected:
     virtual ~Observer() {}
   };
@@ -343,6 +348,11 @@ class GDataFileSystemInterface {
                                const FilePath& file_content_path,
                                GDataCache::FileOperationType cache_operation,
                                const base::Closure& callback) = 0;
+
+  // Registers remote file system proxy for drive mount point.
+  virtual void AddDriveMountPoint() = 0;
+  // Unregisters drive mount point from File API.
+  virtual void RemoveDriveMountPoint() = 0;
 };
 
 }  // namespace gdata