[Mac] Replace SetOverlayView with AllowOtherViews.

content/public/browser/web_contents.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 559 matching lines @@
 #elif defined(OS_MACOSX)
   // The web contents view assumes that its view will never be overlapped by
   // another view (either partially or fully). This allows it to perform
   // optimizations. If the view is in a view hierarchy where it might be
   // overlapped by another view, notify the view by calling this with |true|.
   virtual void SetAllowOverlappingViews(bool overlapping) = 0;
 
   // Returns true if overlapping views are allowed, false otherwise.
   virtual bool GetAllowOverlappingViews() = 0;
 
-  // To draw two overlapping web contents view, the underlaying one should
-  // know about the overlaying one. Caller must ensure that |overlay| exists
-  // until |RemoveOverlayView| is called.
-  virtual void SetOverlayView(WebContents* overlay,
-                              const gfx::Point& offset) = 0;
+  // Allowing other views disables optimizations which assume that only a single
+  // WebContents is present.
+  virtual void SetAllowOtherViews(bool allow) = 0;
 
-  // Removes the previously set overlay view.
-  virtual void RemoveOverlayView() = 0;
+  // Returns true if other views are allowed, false otherwise.
+  virtual bool GetAllowOtherViews() = 0;
 #endif  // OS_ANDROID
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_