[Mac] Add a perf test that counts the number of Mach ports in the browser.

chrome/common/automation_messages_internal.h

 // 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.
 
 // Defines the IPC messages used by the automation interface.
 
 // NOTE: All IPC messages have either a routing_id of 0 (for asynchronous
 //       messages), or one that's been assigned by the proxy (for calls
 //       which expect a response).  The routing_id shouldn't be used for
 //       any other purpose in these message types.
@@ skipping 1488 matching lines @@
 // This message notifies the AutomationProvider to append a new tab to the
 // window with the given handle. The tab will be opened in the background
 // like it was middle-clicked.  The return value contains the index of
 // the new tab, or -1 if the request failed.
 // The second parameter is the url to be loaded in the new tab.
 IPC_SYNC_MESSAGE_CONTROL2_1(AutomationMsg_AppendBackgroundTab,
                             int,
                             GURL,
                             int)
 
+// Used on Mac OS X to read the number of active Mach ports used in the browser
+// process.
+IPC_SYNC_MESSAGE_CONTROL0_1(AutomationMsg_GetMachPortCount,
+                            int /* number of Mach ports */)
+
 // Browser -> renderer messages.
 
 // Requests a snapshot.
 IPC_MESSAGE_ROUTED0(AutomationMsg_SnapshotEntirePage)
 
 // Renderer -> browser messages.
 
 // Sent as a response to |AutomationMsg_Snapshot|.
 IPC_MESSAGE_ROUTED3(AutomationMsg_SnapshotEntirePageACK,
                     bool /* success */,
                     std::vector<unsigned char> /* png bytes */,
                     std::string /* error message */)
 
 // Sent when the renderer has scheduled a client redirect to occur.
 IPC_MESSAGE_ROUTED2(AutomationMsg_WillPerformClientRedirect,
                     int64 /* frame_id */,
                     double /* # of seconds till redirect will be performed */)
 
 // Sent when the renderer has completed or canceled a client redirect for a
 // particular frame. This message may be sent multiple times for the same
 // redirect.
 IPC_MESSAGE_ROUTED1(AutomationMsg_DidCompleteOrCancelClientRedirect,
                     int64 /* frame_id */)
 
 // YOUR NEW MESSAGE MIGHT NOT BELONG HERE.
 // This is the section for renderer -> browser automation messages. If it is
 // an automation <-> browser message, put it above this section. The "no line
 // number change" applies only to the automation <-> browser messages.