Change overview mode to so that docked panel windows are not grouped together.

ash/wm/overview/window_selector.h

Index: ash/wm/overview/window_selector.h
diff --git a/ash/wm/overview/window_selector.h b/ash/wm/overview/window_selector.h
index a270b489a739a3f215f9d4b9817005a4f5803031..576cbba9edf50e746c07339cdbdb4a2731926a3b 100644
--- a/ash/wm/overview/window_selector.h
+++ b/ash/wm/overview/window_selector.h
@@ -66,16 +66,29 @@ class ASH_EXPORT WindowSelector
   typedef std::vector<aura::Window*> WindowList;
   typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
 
-  WindowSelector(const WindowList& windows,
-                 WindowSelectorDelegate* delegate);
+  explicit WindowSelector(WindowSelectorDelegate* delegate);
   ~WindowSelector() override;
 
+  // NOTE: The work done in Init() and Shutdown() is not done in the
+  // constructor/destructor because it may cause other, unrelated classes,
+  // (ie PanelLayoutManager) to make indirect calls to
+  // restoring_minimized_windows() on a partially constructed/destructed object.
+
+  // Initialize with the windows that can be selected.
+  void Init(const WindowList& windows);
+  // Perform cleanup that cannot be done in the destructor.
+  void Shutdown();
+
   // Cancels window selection.
   void CancelSelection();
 
   // Called when the last window selector item from a grid is deleted.
   void OnGridEmpty(WindowGrid* grid);
 
+  bool restoring_minimized_windows() const {
+    return restoring_minimized_windows_;
+  }
+
   // gfx::DisplayObserver:
   void OnDisplayAdded(const gfx::Display& display) override;
   void OnDisplayRemoved(const gfx::Display& display) override;
@@ -169,6 +182,10 @@ class ASH_EXPORT WindowSelector
   // during this overview mode session.
   size_t num_times_textfield_cleared_;
 
+  // Tracks whether minimized windows are currently being restored for overview
+  // mode.
+  bool restoring_minimized_windows_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };