Add window overview mode behind --ash-enable-overview-mode flag to F5 key.

ash/wm/window_cycle_controller.h

Index: ash/wm/window_cycle_controller.h
diff --git a/ash/wm/window_cycle_controller.h b/ash/wm/window_cycle_controller.h
index 9f5b8be9cfbe0092609e3955ca6347601a7b6007..407dc0f400d290c033c636953bc225010bd6a662 100644
--- a/ash/wm/window_cycle_controller.h
+++ b/ash/wm/window_cycle_controller.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "ash/ash_export.h"
+#include "ash/wm/window_selector_delegate.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/activation_change_observer.h"
@@ -29,6 +30,7 @@ class EventHandler;
 namespace ash {
 
 class WindowCycleList;
+class WindowSelector;
 
 // Controls cycling through windows with the keyboard, for example, via alt-tab.
 // Windows are sorted primarily by most recently used, and then by screen order.
@@ -39,7 +41,8 @@ class WindowCycleList;
 // order.
 class ASH_EXPORT WindowCycleController
     : public aura::client::ActivationChangeObserver,
-      public aura::WindowObserver {
+      public aura::WindowObserver,
+      public WindowSelectorDelegate {

[sky, 2013/07/25 21:18:37]

Is there a reason for baking the overview into this class? I tend to think the
code you care about here should be refactored so that both WindowCycleController
and overview code can use it.

[flackr, 2013/07/25 21:34:33]

Eventually, we'll use overview (WindowSelector) for alt tab cycling as well
(http://crbug.com/263481) which is why I was baking it in here. But I think the
point still stands even then. I'll try to refactor out the common high level
behavior, into something used for selection regardless of whether it was by alt
tab or overview.

  public:
   enum Direction {
     FORWARD,
@@ -66,6 +69,11 @@ class ASH_EXPORT WindowCycleController
   // terminate the existing multi-step cycle.
   void AltKeyReleased();
 
+  // Enters overview mode. This is essentially the window cycling mode however
+  // not released on releasing the alt key and allows selecting with the mouse
+  // or touch rather than keypresses.
+  void ToggleOverview();
+
   // Returns true if we are in the middle of a window cycling gesture.
   bool IsCycling() const { return windows_.get() != NULL; }
 
@@ -88,6 +96,9 @@ class ASH_EXPORT WindowCycleController
       const std::list<aura::Window*>* mru_windows,
       bool top_most_at_end);
 
+  // WindowSelectorDelegate:
+  virtual void SelectWindow(aura::Window* window) OVERRIDE;
+
  private:
   // Call to start cycling windows.  You must call StopCycling() when done.
   void StartCycling();
@@ -113,6 +124,7 @@ class ASH_EXPORT WindowCycleController
   virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
+  scoped_ptr<WindowSelector> window_selector_;
   scoped_ptr<WindowCycleList> windows_;
 
   // Event handler to watch for release of alt key.