Adding MimeHandlerView.

extensions/common/extension_messages.h

 // Copyright 2014 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 extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 494 matching lines @@
                      std::vector<std::string> /* CSS selectors */)
 
 // Send by the browser to indicate a Blob handle has been transferred to the
 // renderer. This is sent after the actual extension response, and depends on
 // the sequential nature of IPCs so that the blob has already been caught.
 // This is a separate control message, so that the renderer process will send
 // an acknowledgement even if the RenderView has closed or navigated away.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_TransferBlobs,
                      std::vector<std::string> /* blob_uuids */)
 
+// The ACK for ExtensionHostMsg_CreateMimeHandlerViewGuest.
+IPC_MESSAGE_CONTROL1(ExtensionMsg_CreateMimeHandlerViewGuestACK,
+                     int /* element_instance_id */)
+
 // Messages sent from the renderer to the browser.
 
 // A renderer sends this message when an extension process starts an API
 // request. The browser will always respond with a ExtensionMsg_Response.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_Request,
                     ExtensionHostMsg_Request_Params)
 
 // A renderer sends this message when an extension process starts an API
 // request. The browser will always respond with a ExtensionMsg_Response.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_RequestForIOThread,
@@ skipping 201 matching lines @@
                     extensions::StackTrace /* stack trace */,
                     int32 /* severity level */)
 
 // Sent by the renderer to set initialization parameters of a Browser Plugin
 // that is identified by |element_instance_id|.
 IPC_MESSAGE_CONTROL4(ExtensionHostMsg_AttachGuest,
                      int /* routing_id */,
                      int /* element_instance_id */,
                      int /* guest_instance_id */,
                      base::DictionaryValue /* attach_params */)
+
+// Tells the browser to create a mime handler guest view for a plugin.
+IPC_MESSAGE_CONTROL4(ExtensionHostMsg_CreateMimeHandlerViewGuest,
+                     int /* render_frame_id */,
+                     std::string /* embedder_url */,
+                     std::string /* mime_type */,
+                     int /* element_instance_id */)