Handle the ViewHostMsg_RunFileChooser IPC message which is sent by content(renderer) in RVH and

content/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2011 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.
 
 #include "content/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 700 matching lines @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidZoomURL, OnDidZoomURL)
     IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_RequestPermission,
                         OnRequestDesktopNotificationPermission)
     IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_Show,
                         OnShowDesktopNotification)
     IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_Cancel,
                         OnCancelDesktopNotification)
 #if defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ShowPopup, OnMsgShowPopup)
 #endif
+    IPC_MESSAGE_HANDLER(ViewHostMsg_RunFileChooser, OnRunFileChooser)
+
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(handled = RenderWidgetHost::OnMessageReceived(msg))
-    // NOTE: Do not add a message handler that just calls the delegate!
+

[jam, 2011/08/24 20:30:29]

why add this blank line? and also above

[ananta, 2011/08/24 20:38:05]

Removed both lines

+    // NOTE: Do not add a message handler that just calls the delegate!,
     // Dispatch the message directly there instead.
+    // This does not apply to messages sent by content.

[jam, 2011/08/24 20:30:29]

if you add this line, please explain why that's the case (i.e. because content
messages need to be dispatched in content)

[ananta, 2011/08/24 20:38:05]

I removed the whole comment as delegates can live in chrome. For e.g.
ExtensionHost, in which case we don't want them to dispatch content messages.

   IPC_END_MESSAGE_MAP_EX()
 
   if (!msg_is_ok) {
     // The message had a handler, but its de-serialization failed.
     // Kill the renderer.
     UserMetrics::RecordAction(UserMetricsAction("BadMessageTerminate_RVH"));
     process()->ReceivedBadMessage();
   }
 
   return handled;
@@ skipping 615 matching lines @@
   if (view) {
     view->ShowPopupMenu(params.bounds,
                         params.item_height,
                         params.item_font_size,
                         params.selected_item,
                         params.popup_items,
                         params.right_aligned);
   }
 }
 #endif
+
+void RenderViewHost::OnRunFileChooser(
+    const ViewHostMsg_RunFileChooser_Params& params) {
+  delegate_->RunFileChooser(this, params);
+}
+