Switch DomAutomationController to be a RenderFrameObserver.

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 "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/frame_param.h"
@@ skipping 240 matching lines @@
 
 // Sent when the renderer starts loading the page. This corresponds to
 // Blink's notion of the throbber starting. Note that sometimes you may get
 // duplicates of these during a single load.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidStartLoading)
 
 // Sent when the renderer is done loading a page. This corresponds to Blink's
 // notion of the throbber stopping.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidStopLoading)
 
+// Following message is used to communicate the values received by the
+// callback binding the JS to Cpp.
+// An instance of browser that has an automation host listening to it can
+// have a javascript send a native value (string, number, boolean) to the
+// listener in Cpp. (DomAutomationController)
+IPC_MESSAGE_ROUTED2(FrameHostMsg_DomOperationResponse,
+                    std::string  /* json_string */,
+                    int  /* automation_id */)
+
 // Sent to the browser when the renderer detects it is blocked on a pepper
 // plugin message for too long. This is also sent when it becomes unhung
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     base::FilePath /* path */,
                     bool /* is_hung */)
 
 // Sent by the renderer process to indicate that a plugin instance has crashed.
@@ skipping 59 matching lines @@
 // Instructs the frame to swap out for a cross-site transition, including
 // running the unload event handler. Expects a SwapOut_ACK message when
 // finished.
 IPC_MESSAGE_ROUTED0(FrameMsg_SwapOut)
 
 // 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)