Defect 248426: Speak rendered text when no selection is made on Mac

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/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 866 matching lines @@
 // process to release the magnified image.
 IPC_MESSAGE_ROUTED1(ViewMsg_ReleaseDisambiguationPopupBitmap,
                     cc::SharedBitmapId /* id */)
 
 // Notifies the renderer that a snapshot has been retrieved.
 IPC_MESSAGE_ROUTED3(ViewMsg_WindowSnapshotCompleted,
                     int /* snapshot_id */,
                     gfx::Size /* size */,
                     std::vector<unsigned char> /* png */)
 
+// Notifies render view to retrieve rendered text from WebView.
 IPC_MESSAGE_ROUTED0(ViewMsg_GetRenderedText)
 
 #if defined(OS_MACOSX)
 IPC_ENUM_TRAITS_MAX_VALUE(blink::ScrollerStyle, blink::ScrollerStyleOverlay)
 
 // Notification of a change in scrollbar appearance and/or behavior.
 IPC_MESSAGE_CONTROL5(ViewMsg_UpdateScrollbarTheme,
                      float /* initial_button_delay */,
                      float /* autoscroll_button_delay */,
                      bool /* jump_on_track_click */,
@@ skipping 805 matching lines @@
 // Since the browser keeps handles to the allocated transport DIBs, this
 // message is sent to tell the browser that it may release them when the
 // renderer is finished with them.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_FreeTransportDIB,
                      TransportDIB::Id /* DIB id */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.