[ash-md] Hides frame headers in overview mode not using a mask

ash/common/wm/overview/window_grid.cc

Index: ash/common/wm/overview/window_grid.cc
diff --git a/ash/common/wm/overview/window_grid.cc b/ash/common/wm/overview/window_grid.cc
index acc094fa44571115533d014e78cf57a3cd9199c1..10003074a2dd524a2c284f7ff9437a0cccf6b66e 100644
--- a/ash/common/wm/overview/window_grid.cc
+++ b/ash/common/wm/overview/window_grid.cc
@@ -783,6 +783,10 @@ void WindowGrid::OnWindowBoundsChanged(WmWindow* window,
   // Immediately finish any active bounds animation.
   window->StopAnimatingProperty(ui::LayerAnimationElement::BOUNDS);
 
+  if (ash::MaterialDesignController::IsOverviewMaterial()) {
+    PositionWindows(false);
+    return;
+  }
   // Recompute the transform for the window.
   (*iter)->RecomputeWindowTransforms();
 }