[Mac] Replace SetOverlayView with AllowOtherViews.

content/browser/web_contents/web_contents_view.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_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 95 matching lines @@
 #if 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() const = 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(WebContentsView* 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() const = 0;
 
   // If we close the tab while a UI control is in an event-tracking
   // loop, the control may message freed objects and crash.
   // WebContents::Close() calls IsEventTracking(), and if it returns
   // true CloseTabAfterEventTracking() is called and the close is not
   // completed.
   virtual bool IsEventTracking() const = 0;
   virtual void CloseTabAfterEventTracking() = 0;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_