cleanup: increase absolute tolerance for timed tests (#8052)

Author: dbolduc

google/cloud/bigtable/polling_policy_test.cc

@@ -44,8 +44,8 @@ grpc::Status GrpcTransientError() {
 }
 
 using testing_util::chrono_literals::operator"" _ms;
-auto const kLimitedTimeTestPeriod = 50_ms;
-auto const kLimitedTimeTolerance = 10_ms;
+auto const kLimitedTimeTestPeriod = 100_ms;
+auto const kLimitedTimeTolerance = 20_ms;
 
 /**
  * @test Verify that a polling policy configured to run for 50ms

google/cloud/bigtable/rpc_retry_policy_test.cc

@@ -48,8 +48,8 @@ Status PermanentError() {
 
 using ::google::cloud::testing_util::chrono_literals::operator"" _ms;
 
-auto const kLimitedTimeTestPeriod = 50_ms;
-auto const kLimitedTimeTolerance = 10_ms;
+auto const kLimitedTimeTestPeriod = 100_ms;
+auto const kLimitedTimeTolerance = 20_ms;
 
 /**
  * @test Verify that a retry policy configured to run for 50ms works correctly.

google/cloud/internal/retry_policy_test.cc

@@ -43,8 +43,8 @@ using LimitedErrorCountRetryPolicyForTest =
     ::google::cloud::internal::LimitedErrorCountRetryPolicy<
         TestRetryablePolicy>;
 
-auto const kLimitedTimeTestPeriod = std::chrono::milliseconds(50);
-auto const kLimitedTimeTolerance = std::chrono::milliseconds(10);
+auto const kLimitedTimeTestPeriod = std::chrono::milliseconds(100);
+auto const kLimitedTimeTolerance = std::chrono::milliseconds(20);
 
 /**
  * @test Verify that a retry policy configured to run for 50ms works correctly.

google/cloud/polling_policy_test.cc

@@ -40,8 +40,8 @@ using LimitedErrorCountRetryPolicyForTest =
     ::google::cloud::internal::LimitedErrorCountRetryPolicy<
         TestRetryablePolicy>;
 
-auto const kLimitedTimeTestPeriod = ms(50);
-auto const kLimitedTimeTolerance = ms(10);
+auto const kLimitedTimeTestPeriod = ms(100);
+auto const kLimitedTimeTolerance = ms(20);
 
 /**
  * @test Verify that a polling policy configured to run for 50ms works