Pipe the devTools FrameId from blink into the browser for headless

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 1412 matching lines @@
 IPC_MESSAGE_ROUTED1(FrameHostMsg_UpdateViewportIntersection,
                     gfx::Rect /* viewport_intersection */)
 
 // Informs the child that the frame has changed visibility.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_VisibilityChanged, bool /* visible */)
 
 // Indicates that this frame recieved a user gesture, so that the state can be
 // propagated to any remote frames.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_SetHasReceivedUserGesture)
 
+// Used to tell the browser what the DevTools FrameId is. Needed by Headless
+// Chrome.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_SetDevToolsFrameId, std::string)
+
 // Used to tell the parent that the user right clicked on an area of the
 // content area, and a context menu should be shown for it. The params
 // object contains information about the node(s) that were selected when the
 // user right clicked.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ContextMenu, content::ContextMenuParams)
 
 // Notification that the text selection has changed.
 // Note: The second parameter is the character based offset of the
 // base::string16 text in the document.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_SelectionChanged,
@@ skipping 229 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.