Upstream Chrome on iOS source code [10/11].

ios/chrome/test/base/perf_test_ios.mm

+// 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/logging.h"
+#include "base/memory/ptr_util.h"
+#import "ios/chrome/browser/web/chrome_web_client.h"
+#include "ios/chrome/test/base/perf_test_ios.h"
+
+PerfTest::PerfTest(std::string testGroup)
+    : BlockCleanupTest(),
+      testGroup_(testGroup),
+      firstLabel_("1st"),
+      averageLabel_("2nd+"),
+      isWaterfall_(false),
+      verbose_(true),
+      repeatCount_(10),
+      web_client_(base::MakeUnique<ChromeWebClient>()) {}
+PerfTest::PerfTest(std::string testGroup,
+                   std::string firstLabel,
+                   std::string averageLabel,
+                   bool isWaterfall,
+                   bool verbose,
+                   int repeat)
+    : BlockCleanupTest(),
+      testGroup_(testGroup),
+      firstLabel_(firstLabel),
+      averageLabel_(averageLabel),
+      isWaterfall_(isWaterfall),
+      verbose_(verbose),
+      repeatCount_(repeat),
+      web_client_(base::MakeUnique<ChromeWebClient>()) {}
+
+PerfTest::~PerfTest() {}
+
+void PerfTest::LogPerfTiming(std::string testName, base::TimeDelta elapsed) {
+  LogPerfValue(testName, elapsed.InMillisecondsF(), "ms");
+}
+
+void PerfTest::LogPerfValue(std::string testName,
+                            double value,
+                            std::string unit) {
+  NSLog(@"%sRESULT %s: %s= %.3f %s\n", isWaterfall_ ? "*" : "",
+        testGroup_.c_str(), testName.c_str(), value, unit.c_str());
+}
+
+void PerfTest::RepeatTimedRuns(std::string testName,
+                               TimedActionBlock timedAction,
+                               ProceduralBlock postAction) {
+  RepeatTimedRuns(testName, timedAction, postAction, repeatCount_);
+}
+
+void PerfTest::RepeatTimedRuns(std::string testName,
+                               TimedActionBlock timedAction,
+                               ProceduralBlock postAction,
+                               int repeat) {
+  base::TimeDelta firstElapsed;
+  base::TimeDelta totalElapsed;
+  base::TimeDelta maxElapsed;
+  base::TimeDelta minElapsed = base::TimeDelta::FromSeconds(1000);
+  for (int i = 0; i < repeat + 1; ++i) {
+    base::TimeDelta elapsed = timedAction(i);
+    if (i == 0) {
+      std::string label =
+          firstLabel_.length() ? testName + " " + firstLabel_ : testName;
+      LogPerfTiming(label, elapsed);
+      firstElapsed = elapsed;
+    } else {
+      if (verbose_)
+        NSLog(@"%2d: %.3f ms", i, elapsed.InMillisecondsF());
+      totalElapsed += elapsed;
+      if (elapsed > maxElapsed)
+        maxElapsed = elapsed;
+      if (elapsed < minElapsed)
+        minElapsed = elapsed;
+    }
+    if (postAction)
+      postAction();
+  }
+  if (repeat > 2) {
+    base::TimeDelta average =
+        (totalElapsed - maxElapsed - minElapsed) / (repeat - 2);
+    std::string label =
+        averageLabel_.length() ? testName + " " + averageLabel_ : testName;
+    LogPerfTiming(label, average);
+  }
+}
+
+// TODO(leng): Replace this with RepeatTimedRuns when we have figured out
+// the best way to combine various logging requirements in repeated runs.
+base::TimeDelta PerfTest::CalculateAverage(base::TimeDelta* times,
+                                           int count,
+                                           base::TimeDelta* min_time,
+                                           base::TimeDelta* max_time) {
+  DCHECK(times);
+  base::TimeDelta min = times[0];
+  base::TimeDelta max = times[0];
+  base::TimeDelta sum = times[0];
+
+  for (int i = 1; i < count; i++) {
+    sum += times[i];
+    if (times[i] > max)
+      max = times[i];
+    if (times[i] < min)
+      min = times[i];
+  }
+  if (max_time)
+    *max_time = max;
+  if (min_time)
+    *min_time = min;
+  return sum / count;
+}