Random wm frame painting fixes

mash/task_viewer/task_viewer.cc

Index: mash/task_viewer/task_viewer.cc
diff --git a/mash/task_viewer/task_viewer.cc b/mash/task_viewer/task_viewer.cc
index feeb82cfb78567e0df0efe578b016dcf7edf8326..6e3b018b7462dd9ec4820341b938a5045fe120a6 100644
--- a/mash/task_viewer/task_viewer.cc
+++ b/mash/task_viewer/task_viewer.cc
@@ -88,6 +88,9 @@ class TaskViewerContents : public views::WidgetDelegateView,
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("Tasks");
   }
+  bool CanResize() const override { return true; }
+  bool CanMaximize() const override { return true; }
+  bool CanMinimize() const override { return true; }
 
   gfx::ImageSkia GetWindowAppIcon() override {
     // TODO(jamescook): Create a new .pak file for this app and make a custom