Add machinery to show touch editing context menus in OOPIFs.

content/common/frame_messages.h

 // Copyright 2013 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 interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1021 matching lines @@
 // during the current page load happening on the frame.
 IPC_MESSAGE_ROUTED1(FrameMsg_BlinkFeatureUsageReport,
                     std::set<int>) /* features */
 
 // Informs the renderer that mixed content was found by the browser. The
 // included data is used for instance to report to the CSP policy and to log to
 // the frame console.
 IPC_MESSAGE_ROUTED1(FrameMsg_MixedContentFound,
                     FrameMsg_MixedContentFound_Params)
 
+// Sent to inform the renderer to invoke a context menu.
+// The parameter specifies the location in the render view's coordinates.
+IPC_MESSAGE_ROUTED2(FrameMsg_ShowContextMenu,
+                    ui::MenuSourceType,
+                    gfx::Point /* location where menu should be shown */)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
 // Blink and JavaScript error messages to log to the console
 // or debugger UI.
 IPC_MESSAGE_ROUTED4(FrameHostMsg_DidAddMessageToConsole,
                     int32_t,        /* log level */
                     base::string16, /* msg */
                     int32_t,        /* line number */
                     base::string16 /* source id */)
@@ skipping 621 matching lines @@
                     int /* nfr_request_id */,
                     float /* distance */)
 
 IPC_MESSAGE_ROUTED0(FrameHostMsg_NavigationHandledByEmbedder)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.