Add nacl-gdb-script switch.

chrome/browser/nacl_host/test/mock_nacl_gdb.cc

Index: chrome/browser/nacl_host/test/mock_nacl_gdb.cc
===================================================================
--- chrome/browser/nacl_host/test/mock_nacl_gdb.cc	(revision 138748)
+++ chrome/browser/nacl_host/test/mock_nacl_gdb.cc	(working copy)
@@ -14,6 +14,7 @@
 
 static const char kArgs[] = "--args";
 static const char kEvalCommand[] = "--eval-command";
+static const char kCommand[] = "--command";
 static const char kNaClIrt[] = "nacl-irt ";
 static const char kPass[] = "PASS";
 static const char kDump[] = "dump binary value ";
@@ -64,6 +65,15 @@
       }
       continue;
     }
+    if (strcmp(argv[i], kCommand) == 0) {

[Mark Seaborn, 2012/05/24 17:25:58]

It looks to me that if no --command arg is provided, the test will still pass. 
There's no equivalent of has_attach_cmd in this case.

[halyavin, 2012/05/25 09:37:45]

Done.

+      // Command line shouldn't end with --command switch without value.
+      i += 2;
+      CHECK_LE(i, argc);
+      std::string nacl_gdb_script;
+      env->GetVar("NACL_GDB_SCRIPT", &nacl_gdb_script);
+      CHECK_EQ(strcmp(argv[i - 1], nacl_gdb_script.c_str()), 0);
+      continue;
+    }
     // Unknown argument.
     NOTREACHED() << "Invalid argument " << argv[i];
   }