Mojo: Make a public test_support shared library.

mojo/common/test/test_support_impl.cc

+// Copyright 2014 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 "mojo/common/test/test_support_impl.h"
+
+#include "base/test/perf_log.h"
+
+namespace mojo {
+namespace test {
+
+TestSupportImpl::TestSupportImpl() {
+}
+
+TestSupportImpl::~TestSupportImpl() {
+}
+
+void TestSupportImpl::LogPerfResult(const char* test_name,
+                                    double value,
+                                    const char* units) {
+  base::LogPerfResult(test_name, value, units);
+}
+
+}  // namespace test
+}  // namespace mojo