Moves PanelFrameView to common

ash/common/wm/panels/panel_frame_view.h

Index: ash/common/wm/panels/panel_frame_view.h
diff --git a/ash/wm/panels/panel_frame_view.h b/ash/common/wm/panels/panel_frame_view.h
similarity index 92%
rename from ash/wm/panels/panel_frame_view.h
rename to ash/common/wm/panels/panel_frame_view.h
index dbb820704e2e37d74577b3937fd741fa421a9588..6a1f2758c39ef4ef6c3814fc6bec34686c7e67d7 100644
--- a/ash/wm/panels/panel_frame_view.h
+++ b/ash/common/wm/panels/panel_frame_view.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_WM_PANELS_PANEL_FRAME_VIEW_H_
-#define ASH_WM_PANELS_PANEL_FRAME_VIEW_H_
+#ifndef ASH_COMMON_WM_PANELS_PANEL_FRAME_VIEW_H_
+#define ASH_COMMON_WM_PANELS_PANEL_FRAME_VIEW_H_
 
 #include <memory>
 
@@ -41,6 +41,8 @@ class ASH_EXPORT PanelFrameView : public views::NonClientFrameView,
  private:
   void InitHeaderPainter();
 
+  WmWindow* GetWidgetWindow();
+
   // Height from top of window to top of client area.
   int NonClientTopBorderHeight() const;
 
@@ -78,4 +80,4 @@ class ASH_EXPORT PanelFrameView : public views::NonClientFrameView,
 };
 }
 
-#endif  // ASH_WM_PANELS_PANEL_FRAME_VIEW_H_
+#endif  // ASH_COMMON_WM_PANELS_PANEL_FRAME_VIEW_H_