SetContentAsync improvements (#844)

Load LifecycleWatcher before injecting the HTML

lib/PuppeteerSharp/Frame.cs

@@ -557,17 +557,16 @@ public async Task SetContentAsync(string html, NavigationOptions options = null)
         {
             var waitUntil = options?.WaitUntil ?? new[] { WaitUntilNavigation.Load };
             var timeout = options?.Timeout ?? Puppeteer.DefaultTimeout;
-
-            // We rely upon the fact that document.open() will reset frame lifecycle with "init"
-            // lifecycle event. @see https://crrev.com/608658
+            var watcher = new LifecycleWatcher(FrameManager, this, waitUntil, timeout);
+
+            // We rely upon the fact that document.open() will reset frame lifecycle with "init"
+            // lifecycle event. @see https://crrev.com/608658
             await EvaluateFunctionAsync(@"html => {
                 document.open();
                 document.write(html);
                 document.close();
             }", html);
 
-            var watcher = new LifecycleWatcher(FrameManager, this, waitUntil, timeout);
-
             var watcherTask = await Task.WhenAny(
                 watcher.TimeoutOrTerminationTask,
                 watcher.LifecycleTask).ConfigureAwait(false);