[Presentation API] Fix race condition in which state change is lost.

third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp

Index: third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp b/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
index be94c78b5cbe27f3800a4a7eeafc31a025dc6703..404deb1c4ac2521ab549785626876551b5e39f38 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
+++ b/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
@@ -200,6 +200,9 @@ PresentationConnection* PresentationConnection::take(
       createSameThreadTask(&PresentationConnection::dispatchEventAsync,
                            wrapPersistent(request), wrapPersistent(event)));
 
+  // Fire onconnect event asynchronously, after onconnectionavailable.
+  connection->didChangeState(WebPresentationConnectionState::Connected);
+
   return connection;
 }