Do not switch a connection if the new connection is not ready to send packets.

webrtc/base/gunit.h

Index: webrtc/base/gunit.h
diff --git a/webrtc/base/gunit.h b/webrtc/base/gunit.h
index b087badd94ab5cbd64803db680b4026fcdbec444..c3e853458c87558549869f44c21deba51501d57d 100644
--- a/webrtc/base/gunit.h
+++ b/webrtc/base/gunit.h
@@ -92,23 +92,23 @@
 
 // Wait until "ex" is true, or "timeout" expires, using fake clock where
 // messages are processed every millisecond.
-#define SIMULATED_WAIT(ex, timeout, clock)                  \
-  for (int64_t start = rtc::TimeMillis();                   \
-       !(ex) && rtc::TimeMillis() < start + (timeout);) {   \
-    clock.AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
+#define SIMULATED_WAIT(ex, timeout, clock)                    \
+  for (int64_t start = rtc::TimeMillis();                     \
+       !(ex) && rtc::TimeMillis() < start + (timeout);) {     \
+    (clock).AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
   }
 
 // This returns the result of the test in res, so that we don't re-evaluate
 // the expression in the XXXX_WAIT macros below, since that causes problems
 // when the expression is only true the first time you check it.
-#define SIMULATED_WAIT_(ex, timeout, res, clock)              \
-  do {                                                        \
-    int64_t start = rtc::TimeMillis();                        \
-    res = (ex);                                               \
-    while (!res && rtc::TimeMillis() < start + (timeout)) {   \
-      clock.AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
-      res = (ex);                                             \
-    }                                                         \
+#define SIMULATED_WAIT_(ex, timeout, res, clock)                \
+  do {                                                          \
+    int64_t start = rtc::TimeMillis();                          \
+    res = (ex);                                                 \
+    while (!res && rtc::TimeMillis() < start + (timeout)) {     \
+      (clock).AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
+      res = (ex);                                               \
+    }                                                           \
   } while (0)
 
 // The typical EXPECT_XXXX, but done until true or a timeout with a fake clock.