[ios] Use SpinRunLoopWithMinDelay in MetaTagsTestCase.

base/test/ios/wait_util.mm

Index: base/test/ios/wait_util.mm
diff --git a/base/test/ios/wait_util.mm b/base/test/ios/wait_util.mm
index c69b692eff168eda7f90ae45e09cbc1bf344a025..05fc5147f9b6df5c931dc8944e96cf72c69d0917 100644
--- a/base/test/ios/wait_util.mm
+++ b/base/test/ios/wait_util.mm
@@ -57,6 +57,13 @@ void SpinRunLoopWithMaxDelay(TimeDelta max_delay) {
                            beforeDate:beforeDate];
 }
 
+void SpinRunLoopWithMinDelay(TimeDelta min_delay) {
+  ElapsedTimer timer;
+  while (timer.Elapsed() < min_delay) {
+    SpinRunLoopWithMaxDelay(base::TimeDelta::FromMilliseconds(10));
+  }
+}
+
 }  // namespace ios
 }  // namespace test
 }  // namespace base