Add a NaCl-Private interface for opening files in DIR_PNACL_COMPONENT.

chrome/common/render_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 file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 477 matching lines @@
 // a new instance of the Native Client process. The browser will launch
 // the process and return an IPC channel handle. This handle will only
 // be valid if the NaCl IPC proxy is enabled.
 IPC_SYNC_MESSAGE_CONTROL2_2(ChromeViewHostMsg_LaunchNaCl,
                             GURL /* manifest_url */,
                             int /* socket count */,
                             std::vector<nacl::FileDescriptor>
                                 /* imc channel handles */,
                             IPC::ChannelHandle /* ipc_channel_handle */)
 
+// A renderer sends this to the browser process when it wants to start
+// open a file for from the Pnacl component directory.
+IPC_SYNC_MESSAGE_CONTROL1_1(ChromeViewHostMsg_GetReadonlyPnaclFD,
+                            std::string /* name of requested PNaCl file */,
+                            IPC::PlatformFileForTransit /* output file */)
+
 // Notification that the page has an OpenSearch description document
 // associated with it.
 IPC_MESSAGE_ROUTED3(ChromeViewHostMsg_PageHasOSDD,
                     int32 /* page_id */,
                     GURL /* url of OS description document */,
                     search_provider::OSDDType)
 
 // Find out if the given url's security origin is installed as a search
 // provider.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetSearchProviderInstallState,
@@ skipping 117 matching lines @@
 // previous SetCookie message to be processed.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetCookies,
                            GURL /* url */,
                            GURL /* first_party_for_cookies */,
                            std::string /* cookies */)
 
 // Provide the browser process with current renderer framerate.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_FPS,
                      int /* routing id */,
                      float /* frames per second */)