Set drive as the default download folder

chrome/browser/chromeos/drive/file_system_util.h

Index: chrome/browser/chromeos/drive/file_system_util.h
diff --git a/chrome/browser/chromeos/drive/file_system_util.h b/chrome/browser/chromeos/drive/file_system_util.h
index 43ae4c51b09f87763f0c36657a3883764d468a87..278ecbc88790e6860a1b4cdd225ad46fea6c1c85 100644
--- a/chrome/browser/chromeos/drive/file_system_util.h
+++ b/chrome/browser/chromeos/drive/file_system_util.h
@@ -59,6 +59,10 @@ const base::FilePath& GetDriveMyDriveRootPath();
 // Returns the Drive mount point path, which looks like "/special/drive-<hash>".
 base::FilePath GetDriveMountPointPath(Profile* profile);
 
+// Returns the Drive mount point path, which looks like
+// "/special/drive-<username_hash>", when provided with the |user_id_hash|.
+base::FilePath GetDriveMountPointPathForUserIdHash(std::string user_id_hash);
+
 // Returns the FileSystem for the |profile|. If not available (not mounted
 // or disabled), returns NULL.
 FileSystemInterface* GetFileSystemByProfile(Profile* profile);