[ChromeDriver] Speed up DevTools connection on Windows

While connecting to DevTools on localhost, try using IPv4 first,
since DevTools prefer IPv4 over IPv6.

Change-Id: I7e960789fe8268e850d4eb9cb9928ecc26cab8fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523468Reviewed-by: Shengfa Lin <shengfa@google.com>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825630}

chrome/test/chromedriver/net/websocket.cc

@@ -99,10 +99,14 @@ void WebSocket::Connect(net::CompletionOnceCallback callback) {
   }
 
   if (url_.host() == "localhost") {
-    // ensure that both localhost addresses are included
-    // see https://bugs.chromium.org/p/chromedriver/issues/detail?id=3316
-    addresses.push_back(net::IPEndPoint(net::IPAddress::IPv4Localhost(), port));
-    addresses.push_back(net::IPEndPoint(net::IPAddress::IPv6Localhost(), port));
+    // Ensure that both localhost addresses are included.
+    // See https://bugs.chromium.org/p/chromedriver/issues/detail?id=3316.
+    // Put IPv4 address at front, followed by IPv6 address, since that is
+    // the ordering used by DevTools.
+    addresses.endpoints().insert(
+        addresses.begin(),
+        {net::IPEndPoint(net::IPAddress::IPv4Localhost(), port),
+         net::IPEndPoint(net::IPAddress::IPv6Localhost(), port)});
     addresses.Deduplicate();
   }