<webview>: Implement dialog API

content/common/browser_plugin/browser_plugin_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.
 
 // Multiply-included message header, no traditional include guard.
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
@@ skipping 235 matching lines @@
 // Sets the name of the guest window to the provided |name|.
 IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetName,
                     int /* instance_id */,
                     std::string /* name */)
 
 // Tells the guest that its request for an API permission has been allowed or
 // denied.
 // Note that |allow| = true does not readily mean that the guest will be granted
 // permission, since a security check in the embedder might follow. For example
 // for media access permission, the guest will be granted permission only if its
-// embedder also has access.
-IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_RespondPermission,
+// embedder also has access. For certain APIs, such as the Dialog API,
+// additional information may be passed by the developer through |user_input|.
+IPC_MESSAGE_ROUTED4(BrowserPluginHostMsg_RespondPermission,
                     int /* instance_id */,
                     int /* request_id */,
-                    bool /* allow */)
+                    bool /* allow */,
+                    std::string /* user_input */)
 
 // Sends a PointerLock Lock ACK to the BrowserPluginGuest.
 IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_LockMouse_ACK,
                     int /* instance_id */,
                     bool /* succeeded */)
 
 // Sends a PointerLock Unlock ACK to the BrowserPluginGuest.
 IPC_MESSAGE_ROUTED1(BrowserPluginHostMsg_UnlockMouse_ACK, int /* instance_id */)
 
 // Sent when plugin's position has changed without UpdateRect.
@@ skipping 108 matching lines @@
                      int /* instance_id */,
                      BrowserPluginPermissionType /* permission_type */,
                      int /* request_id */,
                      base::DictionaryValue /* request_info */)
 
 // Forwards a PointerLock Unlock request to the BrowserPlugin.
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_SetMouseLock,
                      int /* instance_id */,
                      bool /* enable */)