Make Edit>Speech>Speak Selection work for PDFs on Mac

content/public/browser/browser_plugin_guest_manager.h

 // Copyright 2014 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_BROWSER_PLUGIN_GUEST_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_PLUGIN_GUEST_MANAGER_H_
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 
@@ skipping 11 matching lines @@
   // <owner_process_id, browser_plugin_instance_id> tuple.
   virtual WebContents* GetGuestByInstanceID(int owner_process_id,
                                             int browser_plugin_instance_id);
 
   // Iterates over all WebContents belonging to a given |embedder_web_contents|,
   // calling |callback| for each. If one of the callbacks returns true, then
   // the iteration exits early.
   typedef base::Callback<bool(WebContents*)> GuestCallback;
   virtual bool ForEachGuest(WebContents* embedder_web_contents,
                             const GuestCallback& callback);
+
+  // Returns the "full page" guest if there is one. That is, if there is a
+  // single BrowserPlugin in the given embedder which takes up the full page,
+  // then it is returned.
+  virtual WebContents* GetFullPageGuest(WebContents* embedder_web_contents);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_PLUGIN_GUEST_MANAGER_H_