Add attributions so printf like functions can have their arguments checked.

runtime/vm/message_handler_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/message_handler.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 class MessageHandlerTestPeer {
@@ skipping 32 matching lines @@
   }
 
   void MessageNotify(Message::Priority priority) {
     notify_count_++;
   }
 
   bool HandleMessage(Message* message) {
     // For testing purposes, keep a string with a list of the ports
     // for all messages we receive.
     intptr_t len =
-        OS::SNPrint(NULL, 0, "%s %d", port_buffer_, message->dest_port()) + 1;
+        OS::SNPrint(NULL, 0, "%s %"Pd64"",
+                    port_buffer_,
+                    message->dest_port()) + 1;
     char* buffer = reinterpret_cast<char*>(malloc(len));
-    OS::SNPrint(buffer, len, "%s %d", port_buffer_, message->dest_port());
+    OS::SNPrint(buffer, len, "%s %"Pd64"",
+                port_buffer_,
+                message->dest_port());
     free(port_buffer_);
     port_buffer_ = buffer;
     delete message;
     message_count_++;
     return result_;
   }
 
 
   bool Start() {
     intptr_t len =
@@ skipping 193 matching lines @@
     OS::Sleep(10);
     sleep += 10;
   }
   EXPECT_STREQ(" start 100 1 2 3 4 5 6 7 8 9 10", handler.port_buffer());
 
   handler_peer.decrement_live_ports();
   EXPECT(!handler.HasLivePorts());
 }
 
 }  // namespace dart