Moves CustomFrameViewAsh to common

ash/common/wm_window.h

Index: ash/common/wm_window.h
diff --git a/ash/common/wm_window.h b/ash/common/wm_window.h
index a5670e9554cb6525a94d3142767ff30f599f9f1a..43fd110c480c6ae7963cb82709369b003a2528e8 100644
--- a/ash/common/wm_window.h
+++ b/ash/common/wm_window.h
@@ -43,6 +43,7 @@ struct ShelfItemDetails;
 class WmLayoutManager;
 class WmRootWindowController;
 class WmShell;
+class WmImmersiveFullscreenController;
 class WmTransientWindowObserver;
 class WmWindowObserver;
 enum class WmWindowProperty;
@@ -269,6 +270,11 @@ class ASH_EXPORT WmWindow {
   virtual void ShowResizeShadow(int component) = 0;
   virtual void HideResizeShadow() = 0;
 
+  // Installs a resize handler on the window that makes it easier to resize
+  // the window. See ResizeHandleWindowTargeter for the specifics.
+  virtual void InstallResizeHandleWindowTargeter(
+      WmImmersiveFullscreenController* immersive_fullscreen_controller) = 0;
+
   // See description in SetBoundsInScreen().
   virtual void SetBoundsInScreenBehaviorForChildren(BoundsInScreenBehavior) = 0;