Multiple test timeout 5x

test/core/surface/concurrent_connectivity_test.cc

@@ -44,7 +44,7 @@
 #define NUM_OUTER_LOOPS 10
 #define NUM_INNER_LOOPS 10
 #define DELAY_MILLIS 10
-#define POLL_MILLIS 3000
+#define POLL_MILLIS 15000
 
 #define NUM_OUTER_LOOPS_SHORT_TIMEOUTS 10
 #define NUM_INNER_LOOPS_SHORT_TIMEOUTS 100