Pass result of blockage across content API when new tab blocked.

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 "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/process_util.h"
@@ skipping 207 matching lines @@
 
   // Stop any pending navigation.
   virtual void Stop() = 0;
 
   // Creates a new WebContents with the same state as this one. The returned
   // heap-allocated pointer is owned by the caller.
   virtual WebContents* Clone() = 0;
 
   // Window management ---------------------------------------------------------
 
-  // Adds a new tab or window with the given already-created contents.
-  virtual void AddNewContents(WebContents* new_contents,
+  // Adds a new tab or window with the given already-created contents. Returns
+  // false if the window or tab was blocked.
+  virtual bool AddNewContents(WebContents* new_contents,

[jam, 2012/08/29 00:07:23]

can you get rid of this function altogether? most places that call it go
directly through the delegate. so we can convert the remaining callsites and get
rid of this

                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) = 0;
 
   // Views and focus -----------------------------------------------------------
   // TODO(brettw): Most of these should be removed and the caller should call
   // the view directly.
 
   // Returns the actual window that is focused when this WebContents is shown.
   virtual gfx::NativeView GetContentNativeView() const = 0;
@@ skipping 149 matching lines @@
   // Focuses the location bar.
   virtual void SetFocusToLocationBar(bool select_all) = 0;
 
   // Does this have an opener associated with it?
   virtual bool HasOpener() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_