Make load events in iframe elements work with OOPIF (Chromium side).

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_message_enums.h"
@@ skipping 503 matching lines @@
                     size_t /* max_length */)
 
 // Tells the renderer to insert a link to the specified stylesheet. This is
 // needed to support navigation transitions.
 IPC_MESSAGE_ROUTED1(FrameMsg_AddStyleSheetByURL, std::string)
 
 // Change the accessibility mode in the renderer process.
 IPC_MESSAGE_ROUTED1(FrameMsg_SetAccessibilityMode,
                     AccessibilityMode)
 
+// Dispatch a load event in the iframe element containing this frame.
+IPC_MESSAGE_ROUTED0(FrameMsg_DispatchLoad)
+
 #if defined(OS_ANDROID)
 
 // External popup menus.
 IPC_MESSAGE_ROUTED2(FrameMsg_SelectPopupMenuItems,
                     bool /* user canceled the popup */,
                     std::vector<int> /* selected indices */)
 
 #elif defined(OS_MACOSX)
 
 // External popup menus.
@@ skipping 320 matching lines @@
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ToggleFullscreen, bool /* enter_fullscreen */)
 
 // Messages to signal the presence or absence of BeforeUnload or Unload handlers
 // for a frame. |present| is true if there is at least one of the handlers for
 // the frame.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_BeforeUnloadHandlersPresent,
                     bool /* present */)
 IPC_MESSAGE_ROUTED1(FrameHostMsg_UnloadHandlersPresent,
                     bool /* present */)
 
+// Dispatch a load event for this frame in the iframe element of an
+// out-of-process parent frame.
+IPC_MESSAGE_ROUTED0(FrameHostMsg_DispatchLoad)
+
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 
 // Message to show/hide a popup menu using native controls.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ShowPopup,
                     FrameHostMsg_ShowPopup_Params)
 IPC_MESSAGE_ROUTED0(FrameHostMsg_HidePopup)
 
 #endif