[ios] Use SpinRunLoopWithMinDelay in MetaTagsTestCase.

base/test/ios/wait_util.h

Index: base/test/ios/wait_util.h
diff --git a/base/test/ios/wait_util.h b/base/test/ios/wait_util.h
index 01c6fe72bb733c927e06e256986119ab3592e90f..e32511ac5d1e487bb13b4f3f5492d64754de72df 100644
--- a/base/test/ios/wait_util.h
+++ b/base/test/ios/wait_util.h
@@ -39,9 +39,15 @@ void WaitUntilCondition(ConditionBlock condition,
 void WaitUntilCondition(ConditionBlock condition);
 
 // Lets the run loop of the current thread process other messages
-// within the given maximum delay.
+// within the given maximum delay. This method may return before max_delay
+// elapsed.
 void SpinRunLoopWithMaxDelay(TimeDelta max_delay);
 
+// Lets the run loop of the current thread process other messages
+// within the given minimum delay. This method returns after |min_delay|
+// elapsed.
+void SpinRunLoopWithMinDelay(TimeDelta min_delay);
+
 }  // namespace ios
 }  // namespace test
 }  // namespace base