Adding 20-second timeout to Java and Objective-C tests.

talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m

Index: talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m
diff --git a/talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m b/talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m
index 5070b789b899bcec92fa0e9a1854824eabd26367..2f9f35fa60bc3ecfb9de36723bc2b191adc0d16f 100644
--- a/talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m
+++ b/talk/app/webrtc/objctests/RTCPeerConnectionSyncObserver.m
@@ -139,14 +139,19 @@
   [_expectedMessages addObject:buffer];
 }
 
-- (void)waitForAllExpectationsToBeSatisfied {
+- (BOOL)waitForAllExpectationsToBeSatisfiedWithTimeout:(NSTimeInterval)timeout {

[tkchin_webrtc, 2015/09/25 19:51:04]

might want to NSParameterAssert(timeout >= 0); or timeout > -DBL_EPSILON

   // TODO (fischman):  Revisit.  Keeping in sync with the Java version, but
   // polling is not optimal.
   // https://code.google.com/p/libjingle/source/browse/trunk/talk/app/webrtc/javatests/src/org/webrtc/PeerConnectionTest.java?line=212#212
+  NSDate *endTime = [NSDate dateWithTimeIntervalSinceNow:timeout];

[tkchin_webrtc, 2015/09/25 19:51:04]

nit: dot syntax for properties.
Also, consider using startTime (but up to you).

NSDate *startTime = [NSDate date];
...

if (startTime.timeIntervalSinceNow < -timeout) {
  return NO;
}
...

   while (![self areAllExpectationsSatisfied]) {
+    if ([endTime timeIntervalSinceNow] < 0) {
+      return NO;
+    }
     [[NSRunLoop currentRunLoop]
         runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1]];
   }
+  return YES;
 }
 
 #pragma mark - RTCPeerConnectionDelegate methods