Fix visibility of minimized panels when restoring from overview.

ash/wm/overview/scoped_transform_overview_window.cc

Index: ash/wm/overview/scoped_transform_overview_window.cc
diff --git a/ash/wm/overview/scoped_transform_overview_window.cc b/ash/wm/overview/scoped_transform_overview_window.cc
index d596ccce4a9ba282aa84e3db1342af5eac856088..c561453fecd17cee4ab9495a3e80a3dd1884decd 100644
--- a/ash/wm/overview/scoped_transform_overview_window.cc
+++ b/ash/wm/overview/scoped_transform_overview_window.cc
@@ -186,6 +186,10 @@ ScopedTransformOverviewWindow::~ScopedTransformOverviewWindow() {
       // bounds to the minimized position.
       window_->layer()->SetOpacity(0);
       window_->Hide();
+      // Hiding the window does not update the layer visibility because opacity
+      // is animating to 0 (See VisibilityController::UpdateLayerVisibility).
+      // Showing the window later requires that the layer visibility is false.
+      window_->layer()->SetVisible(false);

[flackr, 2013/10/01 16:09:12]

This is really a workaround. I described the full circumstances in the bug.
vollick@ suggested that when animating opacity we should animation visibility at
the same time. However, as came up in
https://chromiumcodereview.appspot.com/23654037/diff/1/ui/aura/window.cc the
window visibility state does not change if the layer's visibility state is
already the target visibility. Alternately I could move the window_->Hide call
above setting the layer opacity to ensure the visibility gets changed as in
patchset 2.

       window_->SetProperty(aura::client::kShowStateKey,
                            ui::SHOW_STATE_MINIMIZED);
     }