Add statsd microbenchmark and fix a crash in LogEvent

+ We should benchmark the core functions in the critical path.
     1. LogEvent parsing
     2. Log matching
     3. Event processing in various metrics
     ....

+ Using microbenchmark, we can quantify the optimization we do in the future.

    ---------------------------------------------------------
    Benchmark                  Time           CPU Iterations
    ---------------------------------------------------------
    BM_LogEventCreation       4772 ns       4705 ns     145738

Test: make -j64 statsd_benchmark

Bug: 72242322

Change-Id: I43aa704ffdc7cd21e02ef9038eff66ca7022dbfb
diff --git a/cmds/statsd/benchmark/main.cpp b/cmds/statsd/benchmark/main.cpp
new file mode 100644
index 0000000..08921f3
--- /dev/null
+++ b/cmds/statsd/benchmark/main.cpp
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <benchmark/benchmark.h>
+
+BENCHMARK_MAIN();