Make SampleRateCalculator test resilient to float precision issues.

test/cctest/test-profile-generator.cc

Index: test/cctest/test-profile-generator.cc
diff --git a/test/cctest/test-profile-generator.cc b/test/cctest/test-profile-generator.cc
index 308f764ab4902ab84cd3a98e444391eb5715da57..b0a9b8e71544c47072c17703331a3cc75e52af8f 100644
--- a/test/cctest/test-profile-generator.cc
+++ b/test/cctest/test-profile-generator.cc
@@ -653,7 +653,7 @@ TEST(SampleRateCalculator) {
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 0.75;
   calc2.UpdateMeasurements(time);
   // (1.0 + 2.0 + 2.0) / 3
-  CHECK_EQ(kSamplingIntervalMs * 1.66666, calc2.ticks_per_ms());
+  CHECK_EQ(kSamplingIntervalMs * 5.0, round(calc2.ticks_per_ms() * 3.0));
 
   SampleRateCalculator calc3;
   time = 0.0;
@@ -667,7 +667,7 @@ TEST(SampleRateCalculator) {
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 1.5;
   calc3.UpdateMeasurements(time);
   // (1.0 + 0.5 + 0.5) / 3
-  CHECK_EQ(kSamplingIntervalMs * 0.66666, calc3.ticks_per_ms());
+  CHECK_EQ(kSamplingIntervalMs * 2.0, round(calc3.ticks_per_ms() * 3.0));
 }