Implement new task manager mocks on windows.

app/table_model.h

Index: app/table_model.h
diff --git a/app/table_model.h b/app/table_model.h
index baae39031926b3c0f8ceb2fdb1e9a88ff3d5581a..78dedf187b9397b4a718b71421f8dc3ef70e0a32 100644
--- a/app/table_model.h
+++ b/app/table_model.h
@@ -45,6 +45,9 @@ class TableModel {
   // column zero.
   virtual std::wstring GetTooltip(int row);
 
+  // If true, this row should be indented.
+  virtual bool ShouldIndent(int row);
+
   // Returns true if the TableView has groups. Groups provide a way to visually
   // delineate the rows in a table view. When groups are enabled table view
   // shows a visual separator for each group, followed by all the rows in