Add isGenericFileHandler property to FileTask.

chrome/common/extensions/api/file_manager_private.idl

Index: chrome/common/extensions/api/file_manager_private.idl
diff --git a/chrome/common/extensions/api/file_manager_private.idl b/chrome/common/extensions/api/file_manager_private.idl
index 6fad00250a81289b390e2d6e6d9c977ed341cb36..bd88818de611a3d7e80ea45b6482cfd50b6dc9dc 100644
--- a/chrome/common/extensions/api/file_manager_private.idl
+++ b/chrome/common/extensions/api/file_manager_private.idl
@@ -167,6 +167,12 @@ dictionary FileTask {
 
   // True if this task is a default task for the selected files.
   boolean isDefault;
+
+  // True if this task is from generic file handler. Generic file handler is a
+  // file handler which handles any type of files (e.g. extensions: ["*"],
+  // types: ["*/*"]). Partial wild card (e.g. types: ["image/*"]) is not
+  // generic file handler.
+  boolean isGenericFileHandler;
 };
 
 // Additional entry properties.