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..c8e25a3a1233ed18add49504b292b0cabccae8de 100644
--- a/ash/wm/overview/window_selector.h
+++ b/ash/wm/overview/window_selector.h
@@ -66,16 +66,25 @@ 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;
 
+  // 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;
@@ -117,6 +126,10 @@ class ASH_EXPORT WindowSelector
   // corresponding window grid.
   void Move(Direction direction, bool animate);
 
+  // Removes all observers that were registered during construction and/or
+  // initialization.
+  void RemoveAllObservers();
+
   // Tracks observed windows.
   std::set<aura::Window*> observed_windows_;
 
@@ -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);
 };