Random number distributions and test for common distributions

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diff --git a/test/cpp/qps/qps_interarrival_test.cc b/test/cpp/qps/qps_interarrival_test.cc
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/qps/interarrival.h"
+#include <chrono>
+#include <iostream>
+
+// Use the C histogram rather than C++ to avoid depending on proto
+#include <grpc/support/histogram.h>
+#include <grpc++/config.h>
+
+using grpc::testing::ExpDist;
+using grpc::testing::InterarrivalTimer;
+
+void RunTest(InterarrivalTimer&& timer, std::string title) {
+  gpr_histogram *h(gpr_histogram_create(0.01,60e9));
+  
+  for (int i=0; i<10000000; i++) {
+    for (int j=0; j<5; j++) {
+      gpr_histogram_add(h, timer(j).count());
+    }
+  }
+  
+  std::cout << title <<  " Distribution" << std::endl;
+  std::cout << "Value, Percentile" << std::endl;
+  for (double pct = 0.0; pct < 100.0; pct += 1.0) {
+    std::cout << gpr_histogram_percentile(h, pct) << "," << pct << std::endl;
+  }
+  
+  gpr_histogram_destroy(h);
+}
+
+using grpc::testing::ExpDist;
+using grpc::testing::DetDist;
+using grpc::testing::UniformDist;
+using grpc::testing::ParetoDist;
+
+int main(int argc, char **argv) {
+  RunTest(InterarrivalTimer(ExpDist(10.0), 5), std::string("Exponential(10)"));
+  RunTest(InterarrivalTimer(DetDist(5.0), 5), std::string("Det(5)"));
+  RunTest(InterarrivalTimer(UniformDist(0.0,10.0), 5),
+	  std::string("Uniform(1,10)"));
+  RunTest(InterarrivalTimer(ParetoDist(1.0,1.0), 5),
+	  std::string("Pareto(1,1)"));
+  
+  return 0;
+}