Adds support for calling postMessage on a frame living in a different renderer.

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 "content/common/content_export.h"
@@ skipping 506 matching lines @@
   // request by the render view.  Any of the above bits may be set in flags,
   // which would indicate that this paint message is an ACK for multiple
   // request messages.
   IPC_STRUCT_MEMBER(int, flags)
 
   // Whether or not the renderer expects a ViewMsg_UpdateRect_ACK for this
   // update. True for 2D painting, but false for accelerated compositing.
   IPC_STRUCT_MEMBER(bool, needs_ack)
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(ViewMsg_PostMessage_Params)
+  // The serialized script value.
+  IPC_STRUCT_MEMBER(string16, data)
+
+  // When sent to the browser, this is the routing ID of the source frame in
+  // the source process.  The browser replaces it with the routing ID of the
+  // equivalent (swapped out) frame in the destination process.  Set to
+  // MSG_ROUTING_NONE if the source frame isn't supported (e.g., subframes).
+  IPC_STRUCT_MEMBER(int, source_routing_id)
+
+  // The origin of the source frame.
+  IPC_STRUCT_MEMBER(string16, source_origin)
+
+  // The origin for the message's target.
+  IPC_STRUCT_MEMBER(string16, target_origin)
+IPC_STRUCT_END()
+
 IPC_STRUCT_BEGIN(ViewHostMsg_DidFailProvisionalLoadWithError_Params)
   // The frame ID for the failure report.
   IPC_STRUCT_MEMBER(int64, frame_id)
   // True if this is the top-most frame.
   IPC_STRUCT_MEMBER(bool, is_main_frame)
   // Error code as reported in the DidFailProvisionalLoad callback.
   IPC_STRUCT_MEMBER(int, error_code)
   // An error message generated from the error_code. This can be an empty
   // string if we were unable to find a meaningful description.
   IPC_STRUCT_MEMBER(string16, error_description)
@@ skipping 383 matching lines @@
 // If the fourth parameter is true the result is sent back to the renderer
 // using the message ViewHostMsg_ScriptEvalResponse.
 // ViewHostMsg_ScriptEvalResponse is passed the ID parameter so that the
 // client can uniquely identify the request.
 IPC_MESSAGE_ROUTED4(ViewMsg_ScriptEvalRequest,
                     string16,  /* frame_xpath */
                     string16,  /* jscript_url */
                     int,  /* ID */
                     bool  /* If true, result is sent back. */)
 
+// Posts a message from a frame in another process to the current renderer.
+IPC_MESSAGE_ROUTED1(ViewMsg_PostMessageEvent,
+                    ViewMsg_PostMessage_Params)
+
 // Request for the renderer to evaluate an xpath to a frame and insert css
 // into that frame's document. See ViewMsg_ScriptEvalRequest for details on
 // allowed xpath expressions.
 IPC_MESSAGE_ROUTED2(ViewMsg_CSSInsertRequest,
                     string16,  /* frame_xpath */
                     std::string  /* css string */)
 
 // External popup menus.
 IPC_MESSAGE_ROUTED1(ViewMsg_SelectPopupMenuItem,
                     int /* selected index, -1 means no selection */)
@@ skipping 669 matching lines @@
 
 // Used to go to the session history entry at the given offset (ie, -1 will
 // return the "back" item).
 IPC_MESSAGE_ROUTED1(ViewHostMsg_GoToEntryAtOffset,
                     int /* offset (from current) of history item to get */)
 
 // Sent from an inactive renderer for the browser to route to the active
 // renderer, instructing it to close.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_RouteCloseEvent)
 
+// Sent to the browser from an inactive renderer to post a message to the
+// active renderer.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_RouteMessageEvent,
+                    ViewMsg_PostMessage_Params)
+
 IPC_SYNC_MESSAGE_ROUTED4_2(ViewHostMsg_RunJavaScriptMessage,
                            string16     /* in - alert message */,
                            string16     /* in - default prompt */,
                            GURL         /* in - originating page URL */,
                            ui::JavascriptMessageType /* in - type */,
                            bool         /* out - success */,
                            string16     /* out - user_input field */)
 
 // Requests that the given URL be opened in the specified manner.
 IPC_MESSAGE_ROUTED4(ViewHostMsg_OpenURL,
@@ skipping 398 matching lines @@
                     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(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)