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

chrome/browser/automation/testing_automation_provider.cc

Index: chrome/browser/automation/testing_automation_provider.cc
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index e1e8e46cf101ffe1e0f5c15393cdbc4b0da91ab6..f641ac2ab19b382046a346b23120366ae28e5a3d 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -152,6 +152,10 @@
 #include "chrome/browser/download/download_shelf.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "base/mach_ipc_mac.h"
+#endif
+
 using automation::Error;
 using automation::ErrorCode;
 using automation_util::SendErrorIfModalDialogActive;
@@ -319,6 +323,7 @@ bool TestingAutomationProvider::OnMessageReceived(
     IPC_MESSAGE_HANDLER_DELAY_REPLY(AutomationMsg_AppendTab, AppendTab)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(AutomationMsg_AppendBackgroundTab,
                                     AppendBackgroundTab)
+    IPC_MESSAGE_HANDLER(AutomationMsg_GetMachPortCount, GetMachPortCount)
     IPC_MESSAGE_HANDLER(AutomationMsg_ActiveTabIndex, GetActiveTabIndex)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(AutomationMsg_CloseTab, CloseTab)
     IPC_MESSAGE_HANDLER(AutomationMsg_GetCookies, GetCookies)
@@ -599,6 +604,14 @@ void TestingAutomationProvider::AppendBackgroundTab(
   }
 }
 
+void TestingAutomationProvider::GetMachPortCount(int* port_count) {
+#if defined(OS_MACOSX)
+  base::mac::GetNumberOfMachPorts(mach_task_self(), port_count);
+#else
+  *port_count = 0;
+#endif
+}
+
 void TestingAutomationProvider::GetActiveTabIndex(int handle,
                                                   int* active_tab_index) {
   *active_tab_index = -1;  // -1 is the error code