Enable touch based selection and editing for webpages behind a flag.

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 "base/string16.h"
@@ skipping 899 matching lines @@
 // Executes custom context menu action that was provided from WebKit.
 IPC_MESSAGE_ROUTED2(ViewMsg_CustomContextMenuAction,
                     content::CustomContextMenuContext /* custom_context */,
                     unsigned /* action */)
 
 // Sent in response to a ViewHostMsg_ContextMenu to let the renderer know that
 // the menu has been closed.
 IPC_MESSAGE_ROUTED1(ViewMsg_ContextMenuClosed,
                     content::CustomContextMenuContext /* custom_context */)
 
+// Sent to inform the renderer to invoke a context menu.
+IPC_MESSAGE_ROUTED0(ViewMsg_ShowContextMenu)
+
 // Tells the renderer to perform the specified navigation, interrupting any
 // existing navigation.
 IPC_MESSAGE_ROUTED1(ViewMsg_Navigate, ViewMsg_Navigate_Params)
 
 IPC_MESSAGE_ROUTED0(ViewMsg_Stop)
 
 // Tells the renderer to reload the current focused frame
 IPC_MESSAGE_ROUTED0(ViewMsg_ReloadFrame)
 
 // Sent when the user wants to search for a word on the page (find in page).
@@ skipping 1465 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             string16 /* characters */)
 #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.