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

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 961 matching lines @@
 IPC_MESSAGE_ROUTED1(ViewMsg_Replace,
                     string16)
 IPC_MESSAGE_ROUTED0(ViewMsg_Delete)
 IPC_MESSAGE_ROUTED0(ViewMsg_SelectAll)
 
 // Requests the renderer to select the region between two points.
 IPC_MESSAGE_ROUTED2(ViewMsg_SelectRange,
                     gfx::Point /* start */,
                     gfx::Point /* end */)
 
+#if defined(OS_MACOSX)
+// Requests the renderer to speak the selected text. If text is selected, the
+// renderer will reply with a ViewHostMsg_SpeakText with the selected text.
+IPC_MESSAGE_ROUTED0(ViewMsg_SpeakSelection)
+#endif
+
 // Copies the image at location x, y to the clipboard (if there indeed is an
 // image at that location).
 IPC_MESSAGE_ROUTED2(ViewMsg_CopyImageAt,
                     int /* x */,
                     int /* y */)
 
 // Tells the renderer to perform the given action on the media player
 // located at the given point.
 IPC_MESSAGE_ROUTED2(ViewMsg_MediaPlayerActionAt,
                     gfx::Point, /* location */
@@ skipping 839 matching lines @@
                            uint32 /* buffer size */,
                            base::SharedMemoryHandle /* font data */,
                            uint32 /* font id */)
 #endif
 
 // Send the tooltip text for the current mouse position to the browser.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_SetTooltipText,
                     string16 /* tooltip text string */,
                     WebKit::WebTextDirection /* text direction hint */)
 
+#if defined(OS_MACOSX)
+// Sent in response to ViewMsg_SpeakSelection with the text to be spoken.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_SpeakText,
+                    string16 /* text */)
+#endif
+
 // Notification that the text selection has changed.
 // Note: The secound parameter is the character based offset of the string16
 // text in the document.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_SelectionChanged,
                     string16 /* text covers the selection range */,
                     size_t /* the offset of the text in the document */,
                     ui::Range /* selection range in the document */)
 
 // Notification that the selection bounds have changed.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_SelectionBoundsChanged,
@@ skipping 316 matching lines @@
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)