[Mac]: Enable speech sub-menu under the edit menu and pipe it through to the renderer.

content/public/browser/render_widget_host.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_RENDER_WIDGET_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/keyboard_listener.h"
@@ skipping 104 matching lines @@
   // Edit operations.
   virtual void Undo() = 0;
   virtual void Redo() = 0;
   virtual void Cut() = 0;
   virtual void Copy() = 0;
   virtual void CopyToFindPboard() = 0;
   virtual void Paste() = 0;
   virtual void PasteAndMatchStyle() = 0;
   virtual void Delete() = 0;
   virtual void SelectAll() = 0;
+  virtual void SpeakSelection() = 0;
 
   // Update the text direction of the focused input element and notify it to a
   // renderer process.
   // These functions have two usage scenarios: changing the text direction
   // from a menu (as Safari does), and; changing the text direction when a user
   // presses a set of keys (as IE and Firefox do).
   // 1. Change the text direction from a menu.
   // In this scenario, we receive a menu event only once and we should update
   // the text direction immediately when a user chooses a menu item. So, we
   // should call both functions at once as listed in the following snippet.
@@ skipping 144 matching lines @@
   // within content/.  This method is necessary because
   // RenderWidgetHost is the root of a diamond inheritance pattern, so
   // subclasses inherit it virtually, which removes our ability to
   // static_cast to the subclass.
   virtual RenderWidgetHostImpl* AsRenderWidgetHostImpl() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_