Converts overview to use common ash types

ash/wm/common/wm_globals.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_WM_COMMON_WM_GLOBALS_H_
 #define ASH_WM_COMMON_WM_GLOBALS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 25 matching lines @@
   virtual ~WmGlobals() {}
 
   // This is necessary for a handful of places that is difficult to plumb
   // through context.
   static void Set(WmGlobals* instance);
   static WmGlobals* Get();
 
   virtual WmWindow* GetFocusedWindow() = 0;
   virtual WmWindow* GetActiveWindow() = 0;
 
+  virtual WmWindow* GetPrimaryRootWindow() = 0;
+
   // Returns the root window for the specified display.
   virtual WmWindow* GetRootWindowForDisplayId(int64_t display_id) = 0;
 
   // Returns the root window that newly created windows should be added to.
   // NOTE: this returns the root, newly created window should be added to the
   // appropriate container in the returned window.
   virtual WmWindow* GetRootWindowForNewWindows() = 0;
 
-  // returns the list of more recently used windows excluding modals.
+  // Returns the list of more recently used windows.

[James Cook, 2016/05/27 00:02:51]

super-nit: *most* recently used

[sky, 2016/05/27 03:18:03]

Done.

+  virtual std::vector<WmWindow*> GetMruWindowList() = 0;
+
+  // Returns the list of more recently used windows excluding modals.
   virtual std::vector<WmWindow*> GetMruWindowListIgnoreModals() = 0;
 
   // Returns true if the first window shown on first run should be
   // unconditionally maximized, overriding the heuristic that normally chooses
   // the window size.
   virtual bool IsForceMaximizeOnFirstRun() = 0;
 
   virtual bool IsUserSessionBlocked() = 0;
   virtual bool IsScreenLocked() = 0;
 
@@ skipping 27 matching lines @@
   virtual void RemoveOverviewModeObserver(WmOverviewModeObserver* observer) = 0;
 
  private:
   static WmGlobals* instance_;
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_GLOBALS_H_