Add ppapi perftests infrastructure, plus a performance test for PPP_Messaging.

ppapi/proxy/ppapi_perftests.cc

Index: ppapi/proxy/ppapi_perftests.cc
diff --git a/ppapi/proxy/ppapi_perftests.cc b/ppapi/proxy/ppapi_perftests.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a9138e6a2a2d90d9dcd2b013a699fe110be75eec
--- /dev/null
+++ b/ppapi/proxy/ppapi_perftests.cc
@@ -0,0 +1,10 @@
+// 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.
+
+#include "base/test/perf_test_suite.h"
+
+int main(int argc, char** argv) {
+  return base::PerfTestSuite(argc, argv).Run();
+}
+